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  • 3701.
    Aggeborn, Linuz
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Economics.
    Voter Turnout and the Size of Government" and "Public Finance and Right-Wing Populism2015Licentiate thesis, monograph (Other academic)
  • 3702.
    Aggeborn, Linuz
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Economics.
    Voting System, Voter Turnout, Policy Outcome2011Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    In the last decades a number of countries in the developed world have experienced a drop in voter turnout. The public sector is in the end run by politicians who are elected by the people and for that reason it is interesting to study how a variation in turnout will affect public policy outcome. The purpose of this master’s thesis is to investigate the potential causal link that runs between voting system, turnout and policy by empirically testing the Meltzer & Richard’s theory from 1981. I use Swedish and Finnish municipal panel data and apply IV-regression. The constitutional change in 1970 when Sweden changed from having separate election days for the central and the local governments into having one joint election day, is used as instrument for turnout. I find that an increased turnout rate also leads to higher local tax rate indicating that turnout actually has an impact on policy outcome.

  • 3703.
    Aggeborn, Linuz
    et al.
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Economics.
    Larsson, Malin
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Economics.
    Baklava och baguette: En studie av handelsutvecklingen mellan Turkiet och EU2009Independent thesis Basic level (degree of Bachelor), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    In this study we examine trade patterns between Turkey and 13 member states of the European Union and how these have developed over the time period of 1983 – 2006. To represent the industrial and agricultural goods included in the study we look at the United Nations Standard International Trade Classification (SITC). Following, we investigate internal differences in the EU by selecting four countries each to represent the Northern and Southern countries of the EU. Internal differences were studied in relation to the amount of trade occurring between Turkey and the Northern and Southern countries. The main result is that Turkey is not of great significance for the EU. For Turkey however, the EU is a highly significant trade partner. The observed patterns indicate that trade deepening between Turkey and EU13 has occurred gradually, implying that the Customs Union from 1996 cannot be said to have caused severe differences in the Turkish-EU13 trade relations. For this trade agreement however, no effects on the trade development was directly related to the implementation of the CU. Following, the EU can continue to act as an important partner for future Turkish trade relations. No severe differences are to be expected in the development for trade in goods as free trade already is widely spread within this area. Instead, the major difference of a Turkish entry into the EU will most likely occur when introducing free movement of capital, services and people.

  • 3704.
    Aggeborn, Linuz
    et al.
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Economics.
    Persson, Lovisa
    Institutet För Näringslivsforskning.
    Public Finance and Right-Wing PopulismManuscript (preprint) (Other academic)
  • 3705.
    Aggeborn, Linuz
    et al.
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Government.
    Öhman, Mattias
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Institute for Housing and Urban Research.
    Effekterna av fluorid i dricksvattnet2017Report (Other (popular science, discussion, etc.))
    Abstract [sv]

    Många länder fluoriderar dricksvattnet som en folkhälsoåtgärd. Det finns starkt stöd i tidigare forskning att fluorid förbättrar tandhälsan, men det har även uppkommit en diskussion huruvida det finns negativa bieffekter på kognitiv utveckling. I denna studie undersöker vi om exponering för högre fluoridhalter påverkar kognitiv förmåga, matematikresultat och arbetsmarknadsutfall senare i livet. Vi använder svensk registerdata för individer födda mellan 1985 och 1992 tillsammans med statistik över fluoridhalten i dricksvattnet. För att studera effekterna av fluorid utnyttjar vi det faktum att fluoridhalten i dricksvattnet varierar naturligt. Vi undersöker först effekten på tandhälsa och vi finner positiva effekter. Vi finner inga effekter på kognitiv förmåga eller på matematikresultat. Däremot indikerar våra resultat att inkomsten påverkas positivt, vilket tyder på att bättre tandhälsa kan förbättra individens position på arbetsmarknaden.

  • 3706.
    Aggeborn, Linuz
    et al.
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Economics.
    Öhman, Mattias
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Economics. Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Public Health and Caring Sciences, Clinical Psychology in Healthcare.
    The Effects of Fluoride In The Drinking WaterManuscript (preprint) (Other academic)
  • 3707.
    Aggeryd, Anna
    et al.
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Business Studies.
    de Hevesy, Jessica
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Business Studies.
    Hoffner, Ellen
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Business Studies.
    Öhrner, Cecilia
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Business Studies.
    Telemedicinska samarbeten: - Låt kunskapen flöda!2009Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Inom hälso- och sjukvården spelar informationsteknologi en allt större roll för utvecklingen. Informationsteknologin har skapat nya förutsättningar där chansen till förbättrade vårdrutiner finns inom många områden genom att införa och utveckla användandet av telemedicin.

    Då vi tror att den telemedicinska potentialen kommer att användas i större utsträckning i framtiden känner vi att det finns ett intresse för en utredning av redan existerande samarbeten inom telemedicin. Vi skrev denna uppsats med syftet att undersöka, identifiera och analysera vad som krävs för att möjliggöra ett effektivt telemedicinskt partnerskap inom sjukvården för att förbättra patientens vård, behandling och ta tillvara på de arbetsprocesser som skapas i och med ett telemedicinskt samarbete. Vi har analyserat två olika typer av telemedicinska samarbeten. Vi har genom en kvalitativ undersökning, främst genom intervjuer, grundligt undersökt två av de bestående nätverken för att sedan analysera dessa med hjälp av den modell vi har sammanställt från de teorier om nätverk som vi utgått ifrån.

    Utifrån analysen om Konsensusnätverket är slutsatsen att samarbetet har lett till en förbättring av kvaliteten i behandlingarna. Utifrån detta kan det konstateras att nätverkets existens inte leder till en direkt effektivisering ur ett tidsmässigt perspektiv. Nätverket leder istället till ett optimalt patientomhändertagande som ur ett långsiktigt perspektiv leder till färre felbehandlingar och därmed indirekta kostnadsbesparingar. Slutsatsen vi dragit från Australiensamarbetena är att det främsta utbytet som ges till de medverkande parterna är en förbättrad kvalitet i arbetsförhållandena och därmed även röntgendiagnoserna.

  • 3708.
    Aggeryd, Ingrid
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry.
    Bestämning av Substitutionsgraden hos Natrium-karboxymetylcellulosa, CMC: En tillämpning av den utvidgade Henderson-Hasselbalchs ekvation och simplex-optimering för bestämning av ekvivalensvolymer vid potentiometrisk titrering1984Licentiate thesis, monograph (Other academic)
  • 3709. Aggestam, Karin
    et al.
    Hedin, AstridKronsell, AnnicaSvedberg, Erika
    A World in Transition: Feminist Perspectives on International Relations1997Collection (editor) (Other academic)
  • 3710. Aggestam, Karin
    et al.
    Höglund, Kristine
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Peace and Conflict Research.
    Om krig och fred: En introduktion till freds- och konfliktstudier2017 (ed. 2)Book (Other academic)
  • 3711.
    Aggestam, Karin
    et al.
    Lund University.
    Höglund, KristineUppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Peace and Conflict Research.
    Om krig och fred: En introduktion till freds- och konfliktstudier2012Collection (editor) (Other academic)
    Abstract [sv]

    Hur kan vi förstå uppkomsten och konsekvenserna av dagens konflikter? Vad kan göras för att förhindra att de bryter ut? Och hur kan pågående konflikter lösas på ett sätt som skapar varaktig fred? I denna breda grundbok presenteras centrala frågeställningar och analytiska perspektiv på krig och konflikt, konflikthantering och konfliktlösning, samt fredsbyggande och utveckling. Boken innehåller också illustrativa fallanalyser – allt ifrån första världskriget, kriget i Afghanistan, konflikthantering i Afrika, svensk säkerhetspolitik och försoningsprocesser i Bosnien-Hercegovina till fredsbyggande insatser i Palestina.

  • 3712. Aggestam, Karin
    et al.
    Höglund, Kristine
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Peace and Conflict Research.
    Om studiet av krig och fred2017In: Om krig och fred: En introduktion till freds- och konfliktstudier / [ed] Karin Aggestam och Kristine Höglund, Lund: Studentlitteratur AB, 2017, 2, p. 25-34Chapter in book (Other academic)
  • 3713.
    Aggestam, Karin
    et al.
    Lund University.
    Höglund, Kristine
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Peace and Conflict Research.
    Om studiet av krig och fred2012In: Om krig och fred: En introduktion till freds- och konfliktstudier / [ed] Karin Aggestam & Kristine Höglund, Lund: Studentlitteratur, 2012, p. 23-32Chapter in book (Other academic)
  • 3714.
    Aggestam, Karin
    et al.
    Lund University.
    Svensson, Isak
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Peace and Conflict Research.
    Where Are the Women in Peace Mediation?2018In: Gendering Diplomacy and International Negotiation / [ed] Karin Aggestam & Ann E. Towns, Palgrave Macmillan, 2018, p. 149-168Chapter in book (Refereed)
  • 3715.
    Aggesund, Pamela
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Social and Economic Geography.
    Nyliberal planering och hållbar stadsutveckling: En studie av hur nyliberal planering kan bidra till hållbar stadsutveckling i Stockholms stad2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Den här uppsatsen redovisar en kvalitativ studie som har gjorts av nyliberal planering och hållbar stadsutveckling i Stockholms stad. Genom att studera plan- och visionsdokument utfärdade av staden är syftet med undersökningen att utreda hur nyliberal planering kan förenas med hållbar stadsutveckling. I undersökningen ingår också att utreda vad hållbar stadsutveckling faktiskt innebär utifrån olika perspektiv på hållbar utveckling, perspektiven som studeras är ekologisk modernisering, traditionell ekologi, miljörättviseperspektivet samt social hållbarhet. Resultatet av undersökningen visar att för att hållbar stadsutveckling ska vara ett resultat av nyliberal planering krävs att utvecklingen samtidigt bidrar till ekonomisk tillväxt alternativt stärker stadens konkurrenskraft.  Det innebär att nyliberal planering är lättare att förena med hållbar stadsutveckling såsom det förstås inom ekologisk modernisering men också att hållbar stadsutveckling såsom det förstås inom traditionell ekologi samt social hållbarhet åtminstone till viss del kan förenas med nyliberal planering. Utifrån ett miljörättviseperspektiv visar sig nyliberal planering vara svårare att förena med hållbar stadsutveckling. Resultatet visar också att nyliberal planering inte på ett fullvärdigt sätt kan bidra till en hållbar stadsutveckling. För att alla aspekter inom hållbar utveckling ska tillgodoses krävs något mer än nyliberal planering.

  • 3716.
    Aghaee, Naghmeh
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Informatics and Media.
    Social Media Use in Academia: Campus Students Perceptions of How Using Social Media Supports Educational Learning2010Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Traditional education system on campus has been using as a legacy over decades to support educational learning. The major change over time has been made by the use of technology supporting students in the academic community. As the majority of students in higher education today belong to the digital-age-student generation, they frequently use online technology to interact with instructors, other learners, and to access online materials. In this study, the result is primarily presented from campus students’ perceptions, to gain a deeper understanding of how social media is being used to support educational and collaborative/cooperative learning. Although, almost all the respondents are frequent social media users, only a quarter of them use such media regularly for academic purposes. Through use of social media in academia, students have encountered with benefits─ as convenience, possibility of interaction anywhere/anytime, time-saving, low price and many others─ in addition to facing to limitations─ such as less effective or spontaneous contact, connection problems, lack of platform compatibility, less creative and innovative thinking, and other issues─ which have been discussed in this study.

    This thesis adopted a qualitative research and the characterization of knowledge that is used is exploratory research method with the use of interview as a tool for empirical data collection. Twenty interviews have been conducted with Uppsala University higher education students within random subject disciplines. Among many different social media, the most frequent ones used by majority of students are e-mail, a common asynchronous media to interact with instructors and other learners; and Instant Messaging (IM), a synchronous communication way to interact with co-workers, classmates, or group-mates. Furthermore, learners use social media to coordinate their collaborative/cooperative work, share documents and ask questions. Facebook, Wikipedia, YouTube and other popular social media are also sometimes used for educational purposes.

    The findings indicate that social media seems particularly beneficial for supporting educational learning; though there are some negative aspect and limitations. Learners look at using the technology and social media as a complement to support their studies and collaboration/cooperation. However, not many of them consider using such media as a substitute for face-to-face interactions and the traditional campus education. By drawing on this thesis and the previous studies, proposition on how use of social media supports educational learning in the future has been emerged.

  • 3717. Aghajanova, L.
    et al.
    Altmae, S.
    Stavreus-Evers, Anneli
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Women's and Children's Health, Obstetrics and Gynaecology.
    Giudice, L. C.
    Stanniocalcin-1 in Human Endometrium2015In: Fertility and Sterility, ISSN 0015-0282, E-ISSN 1556-5653, Vol. 103, no 2, p. E6-E7Article in journal (Other academic)
  • 3718.
    Aghajanova, Lusine
    et al.
    Univ Calif San Francisco, Dept Obstet Gynecol & Reprod Sci, 550 16th St,7th Floor,Box 0132, San Francisco, CA 94158 USA..
    Altmae, Signe
    Competence Ctr Hlth Technol, Tartu, Estonia.;Univ Granada, Sch Med, Dept Pediat, Granada, Spain..
    Kasvandik, Sergo
    Competence Ctr Hlth Technol, Tartu, Estonia.;Univ Tartu, Inst Technol, Prote Core Facil, Tartu, Estonia.;Univ Tartu, Womens Clin, Tartu, Estonia..
    Salumets, Andres
    Competence Ctr Hlth Technol, Tartu, Estonia.;Univ Tartu, Womens Clin, Tartu, Estonia..
    Stavreus-Evers, Anneli
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Women's and Children's Health, Obstetrics and Gynaecology.
    Giudice, Linda C.
    Univ Calif San Francisco, Dept Obstet Gynecol & Reprod Sci, 550 16th St,7th Floor,Box 0132, San Francisco, CA 94158 USA..
    Stanniocalcin-1 expression in normal human endometrium and dysregulation in endometriosis2016In: Fertility and Sterility, ISSN 0015-0282, E-ISSN 1556-5653, Vol. 106, no 3, p. 681-691Article in journal (Refereed)
    Abstract [en]

    Objective: To determine expression of stanniocalcin-1 (STC1) in human endometrium with and without endometriosis and its regulation by steroid hormones. Design: Laboratory study. Setting: University. Patient(s): Nineteen women with endometriosis and 33 control women. Intervention(s): Endometrial biopsy and fluid sampling. Main Outcome Measure(s): Analysis of early secretory (ESE) and midsecretory (MSE) endometrial secretomes from fertile women with the use of nano-liquid chromatography-dual mass spectrometry;real-time quantitative polymerase chain reaction, and immunohistochemistry for STC1 and its receptor calcium-sensing receptor (CASR) mRNA and proteins in endometrium with and without endometriosis; evaluation of STC1 and CASR mRNA expression in endometrial stromal fibroblasts (eSF) from women with and without endometriosis decidualized with the use of E2P or 8-bromo-cyclic adenosine monophosphate (cAMP). Result(s): STC1 protein was strongly up-regulated in MSE versus ESE in endometrial fluid of fertile women. STC1 mRNA significantly increased in MSE from women with, but not from those without, endometriosis, compared with proliferative endometrium or ESE, with no significant difference throughout the menstrual cycle between groups. STC1 mRNA in eSF from control women increased >230-fold on decidualization with the use of cAMP versus 45-fold from women with endometriosis, which was not seen on decidualization with E-2/P. CASR mRNA did not exhibit significant differences in any condition and was not expressed in isolated eSF. STC1 protein immunoexpression in eSF was significantly lower in women with endometriosis compared with control women. Conclusion(s): STC1 protein is significantly up-regulated in MSE endometrial fluid and is dysregulated in eutopic endometrial tissue from women with endometriosis. It is likely regulated by cAMP and may be involved in the pathogenesis of decidualization defects.

  • 3719. Aghajanova, Lusine
    et al.
    Altmäe, Signe
    Bjuresten, Kerstin
    Hovatta, Outi
    Landgren, Britt-Marie
    Stavreus-Evers, Anneli
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Women's and Children's Health.
    Disturbances in the LIF pathway in the endometrium among women with unexplained infertility2009In: Fertility and Sterility, ISSN 0015-0282, E-ISSN 1556-5653, Vol. 91, no 6, p. 2602-2610Article in journal (Refereed)
    Abstract [en]

    OBJECTIVE: To study the expression of leukemia inhibitory factor (LIF), its receptors LIFR and gp130, and its inhibitor SOCS1 in endometria from fertile women and infertile women with unexplained infertility. Signaling through the LIF pathway is involved in maintenance of a receptive state of human endometrium. Impaired endometrial receptivity may be a cause of female infertility. DESIGN: Prospective clinical study. SETTING: Hospital-based IVF unit and university-affiliated reproductive research laboratories. PATIENT(S): Twenty-six healthy fertile women and 14 women with unexplained infertility. INTERVENTION(S): Endometrial biopsy. MAIN OUTCOME MEASURE(S): Pinopode formation, expression of LIF, LIFR, gp130, and SOCS1 protein and mRNA in endometrial biopsies. RESULT(S): The expression of LIFR in the endometrium was negatively correlated to the expression of SOCS1 and positively correlated to the formation of pinopodes. In control fertile women, simultaneous intense apical staining of LIFR and gp130 together with faint SOCS1 staining was observed in epithelial cells, whereas the opposite was seen in most women with unexplained infertility. CONCLUSION(S): Unexplained infertility in some women might be explained by disturbances in the LIF pathway in midsecretory-phase endometrium.

  • 3720. Aghajanova, Lusine
    et al.
    Bjuresten, Kerstin
    Altmäe, Signe
    Landgren, Britt-Marie
    Stavreus-Evers, Anneli
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Women's and Children's Health.
    HB-EGF but not amphiregulin or their receptors HER1 and HER4 is altered in endometrium of women with unexplained infertility2008In: Reproductive Sciences, ISSN 1933-7191, Vol. 15, no 5, p. 484-92Article in journal (Refereed)
    Abstract [en]

    Heparin-binding, epidermal growth factor-like growth factor (HB-EGF) and its receptors (HER I and HER4) play a role in the human implantation process. Amphiregulin is a member of the EGF family but with unknown function in human fertility. It has been suggested that some women with unexplained infertility have defective endometrial development. The aim of this study is to determine the presence of amphiregulin and the receptors HER1 and HER4 in normal human endometrium throughout the menstrual cycle. In addition) the present study aims to compare endometrium from women with unexplained infertility with endometrium from women with male factor infertility and healthy fertile controls. Immunohistochemistry and real-time polymerase chain reaction were used to determine the expression of HB-EGF, HER 1, HER4, and amphiregulin. The stromal staining of HER I and the epithelial staining of HER4 were most intense in the mid- and late-secretory-phase endometrium. Amphiregulin did not vary during the menstrual cycle. In the mid-secretory phase, the protein expression of HB-EGF was lower in endometrium from women with unexplained infertility versus normal endometrium and endometrium from women with malefactor infertility. HB-EGF and HER4 mRNA expression in mid-secretory endometrium of women with unexplained and malefactor infertility were increased compared with normal controls. Impaired endometrial expression of certain members of the EGF family may contribute to infertility in some women with unexplained infertility.

  • 3721.
    Aghajanova, Lusine
    et al.
    Dept of Clinical Science, Intervention and Technology, Div of Obstetrics and Gynaecology, Karolinska Institutet, Karolinska University Hospital Huddinge, Stockholm, Sweden.
    Lindeberg, Maria
    Dept of Clinical Science, Intervention and Technology, Div of Obstetrics and Gynaecology, Karolinska Institutet, Karolinska University Hospital Huddinge, Stockholm, Sweden.
    Carlsson, Inger Britt
    Dept of Clinical Science, Intervention and Technology, Div of Obstetrics and Gynaecology, Karolinska Institutet, Karolinska University Hospital Huddinge, Stockholm, Sweden.
    Stavreus-Evers, Anneli
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Women's and Children's Health.
    Zhang, Pu
    Dept of Clinical Science, Intervention and Technology, Div of Obstetrics and Gynaecology, Karolinska Institutet, Karolinska University Hospital Huddinge, Stockholm, Sweden.
    Scott, Jennifer E.
    Dept of Clinical Science, Intervention and Technology, Div of Obstetrics and Gynaecology, Karolinska Institutet, Karolinska University Hospital Huddinge, Stockholm, Sweden.
    Hovatta, Outi
    Dept of Clinical Science, Intervention and Technology, Div of Obstetrics and Gynaecology, Karolinska Institutet, Karolinska University Hospital Huddinge, Stockholm, Sweden.
    Skjöldebrand-Sparre, Lottie
    Division of Obstetrics and Gynaecology, Dept of Clinical Sciences, karolinska Institutet, Danderyd Hospital, Stockholm, Sweden.
    Receptors for thyroid-stimulating hormone and thyroid hormones in human ovarian tissue2009In: Reproductive Biomedicine Online, ISSN 1472-6483, E-ISSN 1472-6491, Vol. 18, no 3, p. 337-347Article in journal (Refereed)
    Abstract [en]

    Dysfunction in thyroid regulation can cause menstrual and ovulatory disturbances, the mechanism of which is not clear. The distribution and activity of the thyroid-stimulating hormone (TSHR), and the thyroid hormone receptors (TR) alpha1, alpha2 and beta1 in human ovarian tissue and in granulosa cells was studied using immunohistochemistry, reverse-transcriptase polymerase chain reaction (RT-PCR), quantitative PCR and immunoassays. Strong immunostaining of TSHR, TRalpha1 and TRbeta1 was observed in ovarian surface epithelium and in oocytes of primordial, primary and secondary follicles, with minimal staining in granulosa cells of secondary follicles. Granulosa cells of antral follicles expressed TSHR, TRalpha1 and TRbeta1 proteins. Messenger RNA for all receptors was present in ovarian tissue. Mature human granulosa cells expressed transcripts for 5' deiodinases types 2 and 3, but not type 1, indicating the possibility of conversion of peripheral thyroid hormone thyroxin (T(4)). Granulosa cells stimulated with TSH showed a significant increase in cAMP concentrations after 2 h of culture (P = 0.047), indicating activation through TSHR. Stimulation with T(4) resulted in increased extracellular signal-regulated kinase 1 and 2 activation after 10, 30, 60 min and 24 h. These data demonstrate that TSH and thyroid hormone receptors may participate in the regulation of ovarian function.

  • 3722. Aghajanova, Lusine
    et al.
    Mahadevan, S
    Altmäe, Signe
    Stavreus-Evers, Anneli
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Women's and Children's Health, Obstetrics and Gynaecology.
    Regan, L
    Sebire, N
    Dixon, P
    Fisher, R A
    Van den Veyver, I B
    No evidence for mutations in NLRP7, NLRP2 or KHDC3L in women with unexplained recurrent pregnancy loss or infertility2015In: Human Reproduction, ISSN 0268-1161, E-ISSN 1460-2350, Vol. 30, no 1, p. 232-238Article in journal (Refereed)
    Abstract [en]

    STUDY QUESTION: Are mutations in NLRP2/7 (NACHT, LRR and PYD domains-containing protein 2/7) or KHDC3L (KH Domain Containing 3 Like) associated with recurrent pregnancy loss (RPL) or infertility?

    SUMMARY ANSWER: We found no evidence for mutations in NLRP2/7 or KHDC3L in unexplained RPL or infertility.

    WHAT IS KNOWN ALREADY: Mutations in NLRP7 and KHDC3L are known to cause biparental hydatidiform moles (BiHMs), a rare form of pregnancy loss. NLRP2, while not associated with the BiHM pathology, is known to cause recurrent Beckwith Weidemann Syndrome (BWS).

    STUDY DESIGN, SIZE, AND DURATION: Ninety-four patients with well characterized, unexplained infertility were recruited over a 9-year period from three IVF clinics in Sweden. Blood samples from 24 patients with 3 or more consecutive miscarriages of unknown etiology were provided by the Recurrent Miscarriage Clinic at St Mary's Hospital, London, UK.

    PARTICIPANTS/MATERIALS, SETTING, METHODS: Patients were recruited into both cohorts following extensive clinical studies. Genomic DNA was isolated from peripheral blood and subject to Sanger sequencing of NLRP2, NLRP7 and KHDC3L. Sequence electropherograms were analyzed by Sequencher v5.0 software and variants compared with those observed in the 1000 Genomes, single nucleotide polymorphism database (dbSNP) and HapMap databases. Functional effects of non-synonymous variants were predicted using Polyphen-2 and sorting intolerant from tolerant (SIFT).

    MAIN RESULTS AND THE ROLE OF CHANCE: No disease-causing mutations were identified in NLRP2, NLRP7 and KHDC3L in our cohorts of unexplained infertility and RPL.

    LIMITATIONS, REASONS FOR CAUTION: Due to the limited patient size, it is difficult to conclude if the low frequency single nucleotide polymorphisms observed in the present study are causative of the phenotype. The design of the present study therefore is only capable of detecting highly penetrant mutations.

    WIDER IMPLICATIONS OF THE FINDINGS: The present study supports the hypothesis that mutations in NLRP7 and KHDC3L are specific for the BiHM phenotype and do not play a role in other adverse reproductive outcomes. Furthermore, to date, mutations in NLRP2 have only been associated with the imprinting disorder BWS in offspring and there is no evidence for a role in molar pregnancies, RPL or unexplained infertility.

    STUDY FUNDING/COMPETING INTERESTS: This study was funded by the following sources: Estonian Ministry of Education and Research (Grant SF0180044s09), Enterprise Estonia (Grant EU30020); Mentored Resident research project (Department of Obstetrics and Gynecology, Baylor College of Medicine); Imperial NIHR Biomedical Research Centre; Grant Number C06RR029965 from the National Center for Research Resources (NCCR; NIH). No competing interests declared.

  • 3723.
    Aghajanova, Lusine
    et al.
    Dept of Obstetrics, Gynecology, and Reproductive Sciences, University of California San Francisco, USA.
    Rumman, Amani
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Women's and Children's Health.
    Altmäe, Signe
    Wånggren, Kjell
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Women's and Children's Health.
    Stavreus-Evers, Anneli
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Women's and Children's Health.
    Diminished endometrial expression of ghrelin and ghrelin receptor contributes to infertility2010In: Reproductive sciences (Thousand Oaks, Calif.), ISSN 1933-7205, Vol. 17, no 9, p. 823-832Article in journal (Refereed)
    Abstract [en]

    The objectives were to investigate the presence, distribution and sex steroid hormone regulation of ghrelin and its receptor, growth hormone secretagogue receptor (GHSR), in human endometrium in relation to endometrial receptivity and fertility. Endometrial biopsies were obtained from women with unexplained infertility and healthy fertile volunteers. Ishikawa cells were used to mimic the action of ghrelin in endometrium. Immunostaining of GHSR was strong in luminal epithelium and stroma during mid-secretory phase. Ghrelin and GHSR expression is less intense in mid-secretory endometrium of infertile women compared to fertile controls. Treatment with estrogen and/or progesterone or their antagonists did not significantly change the relative expression of GHSR in Ishikawa and stromal cells. Ghrelin was present in and secreted from human blastocysts, which suggest that the communication between human blastocyst and endometrium might involve ghrelin. Low levels of GHSR in endometrium from women with unexplained infertility may in part explain the infertility.

  • 3724.
    Aghajanova, Lusine
    et al.
    Dept of Clinical Science, Karolinska Institutet, Stockholm, Sweden.
    Stavreus-Evers, Anneli
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Women's and Children's Health.
    Lindeberg, Maria
    Dept of Clinical Science, Karolinska Institutet, Stockholm, Sweden.
    Landgren, Britt-Marie
    Dept of Clinical Science, Karolinska Institutet, Stockholm, Sweden.
    Skjöldebrand Sparre, Lottie
    Hovatta, Outi
    Dept of Clinical Science, Karolinska Institutet, Stockholm, Sweden.
    Thyroid-stimulating hormone receptor and thyroid hormone receptors are involved in human endometrial physiology2011In: Fertility and Sterility, ISSN 0015-0282, E-ISSN 1556-5653, Vol. 95, no 1, p. 230-237Article in journal (Refereed)
    Abstract [en]

    OBJECTIVE: To study the expression, distribution, and function of thyroid-stimulating hormone receptor (TSHR) and thyroid hormone receptors (TR) alpha1, alpha2, and beta1 in human endometrium. DESIGN: Experimental clinical study. SETTING: University hospital. PATIENT(S): 31 fertile women. INTERVENTION(S): Endometrial biopsy samples obtained throughout the menstrual cycle. MAIN OUTCOME MEASURE(S): Real-time reverse transcriptase polymerase chain reaction, immunohistochemistry and Western blot to study the expression of TSHR, TRalpha1, TRalpha2, and TRbeta1 messenger RNA (mRNA) and proteins in human endometrium. RESULT(S): We found TSHR, TRalpha1, TRalpha2 and TRbeta1 mRNA and proteins expressed in human endometrium. Immunostaining for TSHR in the luminal epithelium and TRalpha1 and beta1 in the glandular and luminal epithelium increased statistically significantly on luteinizing hormone (LH) days 6 to 9, coinciding with appearance of pinopodes. Endometrial stromal and Ishikawa cells expressed mRNA for TSHR, TR, and iodothyronine deiodinases 1-3. After 48 hours, TSH significantly increased leukemia inhibitory factor (LIF) and LIF receptor (LIFR) messenger RNA (mRNA) in endometrial stromal cells, but decreased their expression in Ishikawa cells. Glucose transporter 1 mRNA was up-regulated by TSH in Ishikawa cells. We found that TSH statistically significantly increased secretion of free triiodothyronine (T(3)) and total thyroxin (T(4)) by Ishikawa cells compared with nonstimulated cells. CONCLUSION(S): Thyroid hormones are directly involved in endometrial physiology.

  • 3725.
    Aghanavesi, Somayeh
    et al.
    Dalarna Univ, Falun, Sweden.
    Memedi, Mevludin
    Örebro Univ, Örebro, Sweden.
    Dougherty, Mark
    Dalarna Univ, Falun, Sweden.
    Nyholm, Dag
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Neuroscience, Neurology.
    Westin, Jerker
    Dalarna Univ, Falun, Sweden.
    Verification of a Method for Measuring Parkinson's Disease Related Temporal Irregularity in Spiral Drawings2017In: Sensors, ISSN 1424-8220, E-ISSN 1424-8220, Vol. 17, no 10, article id 2431Article in journal (Refereed)
    Abstract [en]

    -value = 0.02). Test-retest reliability of TIS was good with Intra-class Correlation Coefficient of 0.81. When assessing changes in relation to treatment, TIS contained some information to capture changes from Off to On and wearing off effects. However, the correlations between TIS and clinical scores (UPDRS and Dyskinesia) were weak. TIS was able to differentiate spiral drawings drawn by patients in an advanced stage from those drawn by healthy subjects, and TIS had good test-retest reliability. TIS was somewhat responsive to single-dose levodopa treatment. Since TIS is an upper limb high-frequency-based measure, it cannot be detected during clinical assessment.

  • 3726.
    Aghasyan, M.
    et al.
    Ist Nazl Fis Nucl, Trieste Sect, I-34127 Trieste, Italy..
    Akhunzyanov, R.
    Joint Inst Nucl Res, Moscow 141980, Russia..
    Alexeev, G. D.
    Joint Inst Nucl Res, Moscow 141980, Russia..
    Alexeev, M. G.
    Univ Turin, Dept Phys, I-10125 Turin, Italy..
    Amoroso, A.
    Univ Turin, Dept Phys, I-10125 Turin, Italy.;INFN, Torino Sect, I-10125 Turin, Italy..
    Andrieux, V.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France.;Univ Illinois, Dept Phys, Urbana, IL 61801 USA..
    Anfimov, N. V.
    Joint Inst Nucl Res, Moscow 141980, Russia..
    Anosov, V.
    Joint Inst Nucl Res, Moscow 141980, Russia..
    Antoshkin, A.
    Joint Inst Nucl Res, Moscow 141980, Russia..
    Augsten, K.
    Joint Inst Nucl Res, Moscow 141980, Russia.;Czech Tech Univ, Prague 16636, Czech Republic..
    Augustyniak, W.
    Natl Ctr Nucl Res, PL-00681 Warsaw, Poland..
    Austregesilo, A.
    Tech Univ Munich, Phys Dept, D-85748 Garching, Germany..
    Azevedo, C. D. R.
    Univ Aveiro, Dept Phys, P-3810193 Aveiro, Portugal..
    Badelek, B.
    Univ Warsaw, Fac Phys, PL-02093 Warsaw, Poland..
    Balestra, F.
    Univ Turin, Dept Phys, I-10125 Turin, Italy.;INFN, Torino Sect, I-10125 Turin, Italy..
    Ball, M.
    Univ Bonn, Helmholtz Inst Strahlen & Kernphys, D-53115 Bonn, Germany..
    Barth, J.
    Univ Bonn, Phys Inst, D-53115 Bonn, Germany..
    Beck, R.
    Univ Bonn, Helmholtz Inst Strahlen & Kernphys, D-53115 Bonn, Germany..
    Bedfer, Y.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
    Bernhard, J.
    CERN, CH-1211 Geneva 23, Switzerland.;Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany..
    Bicker, K.
    CERN, CH-1211 Geneva 23, Switzerland.;Tech Univ Munich, Phys Dept, D-85748 Garching, Germany..
    Bielert, E. R.
    CERN, CH-1211 Geneva 23, Switzerland..
    Birsa, R.
    Ist Nazl Fis Nucl, Trieste Sect, I-34127 Trieste, Italy..
    Bodlak, M.
    Charles Univ Prague, Fac Math & Phys, Prague 18000, Czech Republic..
    Bordalo, P.
    LIP, P-1000149 Lisbon, Portugal.;Univ Lisbon, Inst Super Tecn, Lisbon, Portugal..
    Bradamante, F.
    Univ Trieste, Dept Phys, I-34127 Trieste, Italy.;Ist Nazl Fis Nucl, Trieste Sect, I-34127 Trieste, Italy..
    Bressan, A.
    Univ Trieste, Dept Phys, I-34127 Trieste, Italy.;Ist Nazl Fis Nucl, Trieste Sect, I-34127 Trieste, Italy..
    Buchele, M.
    Univ Freiburg, Phys Inst, D-79104 Freiburg, Germany..
    Cchang, W. -C
    Acad Sinica, Inst Phys, Taipei 11529, Taiwan..
    Chatterjee, C.
    Matrivani Inst Expt Res & Educ, Kolkata 700030, W Bengal, India..
    Chiosso, M.
    Univ Turin, Dept Phys, I-10125 Turin, Italy.;INFN, Torino Sect, I-10125 Turin, Italy..
    Choi, I.
    Univ Illinois, Dept Phys, Urbana, IL 61801 USA..
    Chung, S. -U
    Cicuttin, A.
    Ist Nazl Fis Nucl, Trieste Sect, I-34127 Trieste, Italy.;Abdus Salam Int Ctr Theoret Phys, I-34151 Trieste, Italy..
    Crespo, M. L.
    Ist Nazl Fis Nucl, Trieste Sect, I-34127 Trieste, Italy.;Abdus Salam Int Ctr Theoret Phys, I-34151 Trieste, Italy..
    Dalla Torre, S.
    Ist Nazl Fis Nucl, Trieste Sect, I-34127 Trieste, Italy..
    Dasgupta, S. S.
    Dasgupta, S.
    Matrivani Inst Expt Res & Educ, Kolkata 700030, W Bengal, India.;Univ Trieste, Dept Phys, I-34127 Trieste, Italy.;Ist Nazl Fis Nucl, Trieste Sect, I-34127 Trieste, Italy..
    Denisov, O. Yu.
    INFN, Torino Sect, I-10125 Turin, Italy..
    Dhara, L.
    Matrivani Inst Expt Res & Educ, Kolkata 700030, W Bengal, India..
    Donskov, S. V.
    Natl Res Ctr Kurchatov Inst, State Sci Ctr Inst High Energy Phys, Protvino 142281, Russia..
    Doshita, N.
    Yamagata Univ, Yamagata 9928510, Japan..
    Dreisbach, Ch.
    Tech Univ Munich, Phys Dept, D-85748 Garching, Germany..
    Duennweber, W.
    Dziewiecki, M.
    Warsaw Univ Technol, Inst Radioelectr, PL-00665 Warsaw, Poland..
    Efremov, A.
    Joint Inst Nucl Res, Moscow 141980, Russia..
    Eversheim, P. D.
    Univ Bonn, Helmholtz Inst Strahlen & Kernphys, D-53115 Bonn, Germany..
    Faessler, M.
    Ferrero, A.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
    Finger, M.
    Charles Univ Prague, Fac Math & Phys, Prague 18000, Czech Republic..
    Finger, M., Jr.
    Charles Univ Prague, Fac Math & Phys, Prague 18000, Czech Republic..
    Fischer, H.
    Univ Freiburg, Phys Inst, D-79104 Freiburg, Germany..
    Franco, C.
    LIP, P-1000149 Lisbon, Portugal..
    von Hohenesche, N. du Fresne
    CERN, CH-1211 Geneva 23, Switzerland.;Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany..
    Friedrich, J. M.
    Tech Univ Munich, Phys Dept, D-85748 Garching, Germany..
    Frolov, V.
    Joint Inst Nucl Res, Moscow 141980, Russia.;CERN, CH-1211 Geneva 23, Switzerland..
    Fuchey, E.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
    Gautheron, F.
    Univ Bochum, Inst Expt Phys, D-44780 Bochum, Germany..
    Gavrichtchouk, O. P.
    Joint Inst Nucl Res, Moscow 141980, Russia..
    Gerassimov, S.
    Lebedev Phys Inst, Moscow 119991, Russia.;Tech Univ Munich, Phys Dept, D-85748 Garching, Germany..
    Giarra, J.
    Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany..
    Giordano, F.
    Univ Illinois, Dept Phys, Urbana, IL 61801 USA..
    Gnesi, I.
    Univ Turin, Dept Phys, I-10125 Turin, Italy.;INFN, Torino Sect, I-10125 Turin, Italy..
    Gorzellik, M.
    Univ Freiburg, Phys Inst, D-79104 Freiburg, Germany..
    Grasso, A.
    Univ Turin, Dept Phys, I-10125 Turin, Italy.;INFN, Torino Sect, I-10125 Turin, Italy..
    Perdekamp, M. Grosse
    Univ Illinois, Dept Phys, Urbana, IL 61801 USA..
    Grube, B.
    Tech Univ Munich, Phys Dept, D-85748 Garching, Germany..
    Grussenmeyer, T.
    Univ Freiburg, Phys Inst, D-79104 Freiburg, Germany..
    Guskov, A.
    Joint Inst Nucl Res, Moscow 141980, Russia..
    Hahne, D.
    Univ Bonn, Phys Inst, D-53115 Bonn, Germany..
    Hamar, G.
    Ist Nazl Fis Nucl, Trieste Sect, I-34127 Trieste, Italy..
    von Harrach, D.
    Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany..
    Heinsius, F. H.
    Univ Freiburg, Phys Inst, D-79104 Freiburg, Germany..
    Heitz, R.
    Univ Illinois, Dept Phys, Urbana, IL 61801 USA..
    Herrmann, F.
    Univ Freiburg, Phys Inst, D-79104 Freiburg, Germany..
    Horikawa, N.
    Nagoya Univ, Nagoya, Aichi 464, Japan.;Ludwig Maximilians Univ Munchen, Munich, Germany..
    d'Hose, N.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
    Hsieh, C. -Y
    Huber, S.
    Tech Univ Munich, Phys Dept, D-85748 Garching, Germany..
    Ishimoto, S.
    Yamagata Univ, Yamagata 9928510, Japan.;Natl Cent Univ, Dept Phys, 300 Jhongda Rd, Jhongli 32001, Taiwan..
    Ivanov, A.
    Univ Turin, Dept Phys, I-10125 Turin, Italy.;INFN, Torino Sect, I-10125 Turin, Italy..
    Ivanshin, Yu.
    Joint Inst Nucl Res, Moscow 141980, Russia..
    Iwata, T.
    Yamagata Univ, Yamagata 9928510, Japan..
    Jary, V.
    Czech Tech Univ, Prague 16636, Czech Republic..
    Joosten, R.
    Univ Bonn, Helmholtz Inst Strahlen & Kernphys, D-53115 Bonn, Germany..
    Joerg, P.
    Univ Freiburg, Phys Inst, D-79104 Freiburg, Germany..
    Kabuss, E.
    Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany..
    Kerbizi, A.
    Univ Trieste, Dept Phys, I-34127 Trieste, Italy.;Ist Nazl Fis Nucl, Trieste Sect, I-34127 Trieste, Italy..
    Ketzer, B.
    Univ Bonn, Helmholtz Inst Strahlen & Kernphys, D-53115 Bonn, Germany..
    Khaustov, G. V.
    Natl Res Ctr Kurchatov Inst, State Sci Ctr Inst High Energy Phys, Protvino 142281, Russia..
    Khokhlov, Yu. A.
    Natl Res Ctr Kurchatov Inst, State Sci Ctr Inst High Energy Phys, Protvino 142281, Russia.;KEK, 1-1 Oho, Tsukuba, Ibaraki 3050801, Japan..
    Kisselev, Yu.
    Joint Inst Nucl Res, Moscow 141980, Russia..
    Klein, F.
    Univ Bonn, Phys Inst, D-53115 Bonn, Germany..
    Koivuniemi, J. H.
    Univ Bochum, Inst Expt Phys, D-44780 Bochum, Germany.;Univ Illinois, Dept Phys, Urbana, IL 61801 USA..
    Kolosov, V. N.
    Natl Res Ctr Kurchatov Inst, State Sci Ctr Inst High Energy Phys, Protvino 142281, Russia..
    Kondo, K.
    Yamagata Univ, Yamagata 9928510, Japan..
    Koenigsmann, K.
    Univ Freiburg, Phys Inst, D-79104 Freiburg, Germany..
    Konorov, I.
    Lebedev Phys Inst, Moscow 119991, Russia.;Tech Univ Munich, Phys Dept, D-85748 Garching, Germany..
    Konstantinov, V. F.
    Natl Res Ctr Kurchatov Inst, State Sci Ctr Inst High Energy Phys, Protvino 142281, Russia..
    Kotzinian, A. M.
    Univ Turin, Dept Phys, I-10125 Turin, Italy.;INFN, Torino Sect, I-10125 Turin, Italy..
    Kouznetsov, O. M.
    Joint Inst Nucl Res, Moscow 141980, Russia..
    Kral, Z.
    Czech Tech Univ, Prague 16636, Czech Republic..
    Kraemer, M.
    Tech Univ Munich, Phys Dept, D-85748 Garching, Germany..
    Kremser, P.
    Univ Freiburg, Phys Inst, D-79104 Freiburg, Germany..
    Krinner, F.
    Tech Univ Munich, Phys Dept, D-85748 Garching, Germany..
    Kroumchtein, Z. V.
    Joint Inst Nucl Res, Moscow 141980, Russia..
    Kulinich, Y.
    Univ Illinois, Dept Phys, Urbana, IL 61801 USA..
    Kunne, F.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
    Kurek, K.
    Natl Ctr Nucl Res, PL-00681 Warsaw, Poland..
    Kurjata, R. P.
    Warsaw Univ Technol, Inst Radioelectr, PL-00665 Warsaw, Poland..
    Kveton, A.
    Czech Tech Univ, Prague 16636, Czech Republic..
    Lednev, A. A.
    Natl Res Ctr Kurchatov Inst, State Sci Ctr Inst High Energy Phys, Protvino 142281, Russia..
    Levillain, M.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
    Levorato, S.
    Ist Nazl Fis Nucl, Trieste Sect, I-34127 Trieste, Italy..
    Lian, Y. -S
    Lichtenstadt, J.
    Tel Aviv Univ, Sch Phys & Astron, IL-69978 Tel Aviv, Israel..
    Longo, R.
    Univ Turin, Dept Phys, I-10125 Turin, Italy.;INFN, Torino Sect, I-10125 Turin, Italy..
    Maggiora, A.
    INFN, Torino Sect, I-10125 Turin, Italy..
    Magnon, A.
    Univ Illinois, Dept Phys, Urbana, IL 61801 USA..
    Makins, N.
    Univ Illinois, Dept Phys, Urbana, IL 61801 USA..
    Makke, N.
    Ist Nazl Fis Nucl, Trieste Sect, I-34127 Trieste, Italy.;Abdus Salam Int Ctr Theoret Phys, I-34151 Trieste, Italy..
    Mallot, G. K.
    CERN, CH-1211 Geneva 23, Switzerland..
    Marianski, B.
    Natl Ctr Nucl Res, PL-00681 Warsaw, Poland..
    Martin, A.
    Univ Trieste, Dept Phys, I-34127 Trieste, Italy.;Ist Nazl Fis Nucl, Trieste Sect, I-34127 Trieste, Italy..
    Marzec, J.
    Warsaw Univ Technol, Inst Radioelectr, PL-00665 Warsaw, Poland..
    Matousek, J.
    Charles Univ Prague, Fac Math & Phys, Prague 18000, Czech Republic.;Univ Trieste, Dept Phys, I-34127 Trieste, Italy.;Ist Nazl Fis Nucl, Trieste Sect, I-34127 Trieste, Italy..
    Matsuda, H.
    Yamagata Univ, Yamagata 9928510, Japan..
    Matsuda, T.
    Univ Miyazaki, Miyazaki 8892192, Japan..
    Meshcheryakov, G. V.
    Joint Inst Nucl Res, Moscow 141980, Russia..
    Meyer, M.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France.;Univ Illinois, Dept Phys, Urbana, IL 61801 USA..
    Meyer, W.
    Univ Bochum, Inst Expt Phys, D-44780 Bochum, Germany..
    Mikhailov, Yu. V.
    Natl Res Ctr Kurchatov Inst, State Sci Ctr Inst High Energy Phys, Protvino 142281, Russia..
    Mikhasenko, M.
    Univ Bonn, Helmholtz Inst Strahlen & Kernphys, D-53115 Bonn, Germany..
    Mitrofanov, E.
    Mitrofanov, N.
    Joint Inst Nucl Res, Moscow 141980, Russia..
    Miyachi, Y.
    Yamagata Univ, Yamagata 9928510, Japan..
    Nagaytsev, A.
    Joint Inst Nucl Res, Moscow 141980, Russia..
    Nerling, F.
    Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany..
    Neyret, D.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
    Novy, J.
    CERN, CH-1211 Geneva 23, Switzerland.;Czech Tech Univ, Prague 16636, Czech Republic..
    Nowak, W. -D
    Nukazuka, G.
    Yamagata Univ, Yamagata 9928510, Japan..
    Nunes, A. S.
    LIP, P-1000149 Lisbon, Portugal..
    Olshevsky, A. G.
    Joint Inst Nucl Res, Moscow 141980, Russia..
    Orlov, I.
    Joint Inst Nucl Res, Moscow 141980, Russia..
    Ostrick, M.
    Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany..
    Panzieri, D.
    INFN, Torino Sect, I-10125 Turin, Italy.;Univ Piemonte Orientale, I-15100 Alessandria, Italy..
    Parsamyan, B.
    Univ Turin, Dept Phys, I-10125 Turin, Italy.;INFN, Torino Sect, I-10125 Turin, Italy..
    Paul, S.
    Tech Univ Munich, Phys Dept, D-85748 Garching, Germany..
    Peng, J. -C
    Pereira, F.
    Univ Aveiro, Dept Phys, P-3810193 Aveiro, Portugal..
    Pesek, M.
    Charles Univ Prague, Fac Math & Phys, Prague 18000, Czech Republic..
    Peshekhonov, D. V.
    Joint Inst Nucl Res, Moscow 141980, Russia..
    Pierre, N.
    Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany.;Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
    Platchkov, S.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
    Pochodzalla, J.
    Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany..
    Polyakov, V. A.
    Natl Res Ctr Kurchatov Inst, State Sci Ctr Inst High Energy Phys, Protvino 142281, Russia..
    Pretz, J.
    Univ Bonn, Phys Inst, D-53115 Bonn, Germany.;Rhein Westfal TH Aachen, Phys Inst 3, D-52056 Aachen, Germany..
    Quaresma, M.
    LIP, P-1000149 Lisbon, Portugal..
    Quintans, C.
    Ramos, S.
    LIP, P-1000149 Lisbon, Portugal.;Univ Lisbon, Inst Super Tecn, Lisbon, Portugal..
    Regali, C.
    Univ Freiburg, Phys Inst, D-79104 Freiburg, Germany..
    Reicherz, G.
    Univ Bochum, Inst Expt Phys, D-44780 Bochum, Germany..
    Riedl, C.
    Univ Illinois, Dept Phys, Urbana, IL 61801 USA..
    Rogacheva, N. S.
    Joint Inst Nucl Res, Moscow 141980, Russia..
    Roskot, M.
    Charles Univ Prague, Fac Math & Phys, Prague 18000, Czech Republic..
    Ryabchikov, D. I.
    Tech Univ Munich, Phys Dept, D-85748 Garching, Germany.;Natl Res Ctr Kurchatov Inst, State Sci Ctr Inst High Energy Phys, Protvino 142281, Russia..
    Rybnikov, A.
    Joint Inst Nucl Res, Moscow 141980, Russia..
    Rychter, A.
    Warsaw Univ Technol, Inst Radioelectr, PL-00665 Warsaw, Poland..
    Salac, R.
    Czech Tech Univ, Prague 16636, Czech Republic..
    Samoylenko, V. D.
    Natl Res Ctr Kurchatov Inst, State Sci Ctr Inst High Energy Phys, Protvino 142281, Russia..
    Sandacz, A.
    Natl Ctr Nucl Res, PL-00681 Warsaw, Poland..
    Santos, C.
    Ist Nazl Fis Nucl, Trieste Sect, I-34127 Trieste, Italy..
    Sarkar, S.
    Matrivani Inst Expt Res & Educ, Kolkata 700030, W Bengal, India..
    Savin, I. A.
    Joint Inst Nucl Res, Moscow 141980, Russia..
    Sawada, T.
    Acad Sinica, Inst Phys, Taipei 11529, Taiwan..
    Sbrizzai, G.
    Univ Trieste, Dept Phys, I-34127 Trieste, Italy.;Ist Nazl Fis Nucl, Trieste Sect, I-34127 Trieste, Italy..
    Schiavon, P.
    Univ Trieste, Dept Phys, I-34127 Trieste, Italy.;Ist Nazl Fis Nucl, Trieste Sect, I-34127 Trieste, Italy..
    Schmidt, K.
    Univ Freiburg, Phys Inst, D-79104 Freiburg, Germany..
    Schmieden, H.
    Univ Bonn, Phys Inst, D-53115 Bonn, Germany..
    Schönning, Karin
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics. CERN, CH-1211 Geneva 23, Switzerland..
    Seder, E.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
    Selyunin, A.
    Joint Inst Nucl Res, Moscow 141980, Russia..
    Shevchenko, O. Yu.
    Joint Inst Nucl Res, Moscow 141980, Russia..
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    LIP, P-1000149 Lisbon, Portugal..
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    Matrivani Inst Expt Res & Educ, Kolkata 700030, W Bengal, India..
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    Univ Freiburg, Phys Inst, D-79104 Freiburg, Germany..
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    Joint Inst Nucl Res, Moscow 141980, Russia..
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    Joint Inst Nucl Res, Moscow 141980, Russia..
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    AS CR, Inst Sci Instruments, Brno 61264, Czech Republic..
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    CERN, CH-1211 Geneva 23, Switzerland.;Tech Univ Munich, Phys Dept, D-85748 Garching, Germany..
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    LIP, P-1000149 Lisbon, Portugal..
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    CERN, CH-1211 Geneva 23, Switzerland.;Czech Tech Univ, Prague 16636, Czech Republic..
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    Techn Univ Liberec, Liberec 46117, Czech Republic..
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    Yamagata Univ, Yamagata 9928510, Japan.;Ludwig Maximilians Univ Munchen, Munich, Germany..
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    Univ Trieste, Dept Phys, I-34127 Trieste, Italy.;Ist Nazl Fis Nucl, Trieste Sect, I-34127 Trieste, Italy.;Natl Ctr Nucl Res, PL-00681 Warsaw, Poland..
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    Univ Freiburg, Phys Inst, D-79104 Freiburg, Germany..
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    Natl Ctr Nucl Res, PL-00681 Warsaw, Poland..
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    Univ Turin, Dept Phys, I-10125 Turin, Italy.;INFN, Torino Sect, I-10125 Turin, Italy..
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    Joint Inst Nucl Res, Moscow 141980, Russia..
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    Ist Nazl Fis Nucl, Trieste Sect, I-34127 Trieste, Italy..
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    LIP, P-1000149 Lisbon, Portugal..
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    Ist Nazl Fis Nucl, Trieste Sect, I-34127 Trieste, Italy..
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    Univ Bonn, Helmholtz Inst Strahlen & Kernphys, D-53115 Bonn, Germany..
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    Charles Univ Prague, Fac Math & Phys, Prague 18000, Czech Republic..
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    INFN, Torino Sect, I-10125 Turin, Italy..
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    Lebedev Phys Inst, Moscow 119991, Russia..
    Uhl, S.
    Tech Univ Munich, Phys Dept, D-85748 Garching, Germany..
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    CERN, CH-1211 Geneva 23, Switzerland..
    Veloso, J.
    Univ Aveiro, Dept Phys, P-3810193 Aveiro, Portugal..
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    Czech Tech Univ, Prague 16636, Czech Republic..
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    Univ Turin, Dept Phys, I-10125 Turin, Italy..
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    Czech Tech Univ, Prague 16636, Czech Republic..
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    Tech Univ Munich, Phys Dept, D-85748 Garching, Germany..
    Weisrock, T.
    Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany..
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    Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany..
    ter Wolbeek, J.
    Univ Freiburg, Phys Inst, D-79104 Freiburg, Germany..
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    Warsaw Univ Technol, Inst Radioelectr, PL-00665 Warsaw, Poland..
    Zavada, P.
    Joint Inst Nucl Res, Moscow 141980, Russia..
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    Lebedev Phys Inst, Moscow 119991, Russia..
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    Joint Inst Nucl Res, Moscow 141980, Russia..
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    Joint Inst Nucl Res, Moscow 141980, Russia..
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    Warsaw Univ Technol, Inst Radioelectr, PL-00665 Warsaw, Poland..
    First Measurement of Transverse-Spin-Dependent Azimuthal Asymmetries in the Drell-Yan Process2017In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 119, no 11, article id 112002Article in journal (Refereed)
    Abstract [en]

    The first measurement of transverse-spin-dependent azimuthal asymmetries in the pion-induced Drell-Yan (DY) process is reported. We use the CERN SPS 190 GeV/c pi(-) beam and a transversely polarized ammonia target. Three azimuthal asymmetries giving access to different transverse-momentum-dependent (TMD) parton distribution functions (PDFs) are extracted using dimuon events with invariant mass between 4.3 GeV/c(2) and 8.5 GeV/c(2). Within the experimental uncertainties, the observed sign of the Sivers asymmetry is found to be consistent with the fundamental prediction of quantum chromodynamics (QCD) that the Sivers TMD PDFs extracted from DY have a sign opposite to the one extracted from semi-inclusive deep-inelastic scattering (SIDIS) data. We present two other asymmetries originating from the pion Boer-Mulders TMD PDFs convoluted with either the nucleon transversity or pretzelosity TMD PDFs. A recent COMPASS SIDIS measurement was obtained at a hard scale comparable to that of these DY results. This opens the way for possible tests of fundamental QCD universality predictions.

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    Joint Inst Nucl Res, Dubna 141980, Russia.
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    Univ Turin, Dept Phys, I-10125 Turin, Italy;Ist Nazl Fis Nucl, Torino Sect, I-10125 Turin, Italy.
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    Univ Paris Saclay, IRFU, CEA, F-91191 Gif Sur Yvette, France;Univ Illinois, Dept Phys, Urbana, IL 61801 USA.
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    Joint Inst Nucl Res, Dubna 141980, Russia.
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    Joint Inst Nucl Res, Dubna 141980, Russia.
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    Joint Inst Nucl Res, Dubna 141980, Russia.
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    Joint Inst Nucl Res, Dubna 141980, Russia;Czech Tech Univ, Prague 16636, Czech Republic.
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    Natl Ctr Nucl Res, PL-00681 Warsaw, Poland.
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    Tech Univ Munich, Phys Dept, D-85748 Garching, Germany.
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    Univ Aveiro, Dept Phys, P-3810193 Aveiro, Portugal.
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    Univ Warsaw, Fac Phys, PL-02093 Warsaw, Poland.
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    Univ Turin, Dept Phys, I-10125 Turin, Italy;Ist Nazl Fis Nucl, Torino Sect, I-10125 Turin, Italy.
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    Univ Bonn, Helmholtz Inst Strahlen & Kernphys, D-53115 Bonn, Germany.
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    Univ Bonn, Phys Inst, D-53115 Bonn, Germany.
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    Univ Bonn, Helmholtz Inst Strahlen & Kernphys, D-53115 Bonn, Germany.
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    Univ Paris Saclay, IRFU, CEA, F-91191 Gif Sur Yvette, France.
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    CERN, CH-1211 Geneva 23, Switzerland;Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany.
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    CERN, CH-1211 Geneva 23, Switzerland;Tech Univ Munich, Phys Dept, D-85748 Garching, Germany.
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    CERN, CH-1211 Geneva 23, Switzerland.
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    Ist Nazl Fis Nucl, Trieste Sect, I-34127 Trieste, Italy.
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    Charles Univ Prague, Fac Math & Phys, Prague 18000, Czech Republic.
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    LIP, P-1649003 Lisbon, Portugal;Univ Lisbon, Inst Super Tecn, Lisbon, Portugal.
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    Univ Trieste, Dept Phys, I-34127 Trieste, Italy;Ist Nazl Fis Nucl, Trieste Sect, I-34127 Trieste, Italy.
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    Univ Trieste, Dept Phys, I-34127 Trieste, Italy;Ist Nazl Fis Nucl, Trieste Sect, I-34127 Trieste, Italy.
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    Univ Freiburg, Phys Inst, D-79104 Freiburg, Germany.
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    Tomsk Polytech Univ, Tomsk 634050, Russia.
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    Matrivani Inst Expt Res & Educ, Kolkata 700030, W Bengal, India.
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    Univ Turin, Dept Phys, I-10125 Turin, Italy;Ist Nazl Fis Nucl, Torino Sect, I-10125 Turin, Italy.
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    Univ Illinois, Dept Phys, Urbana, IL 61801 USA.
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    Tomsk Polytech Univ, Tomsk 634050, Russia.
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    Ist Nazl Fis Nucl, Trieste Sect, I-34127 Trieste, Italy;Abdus Salam Int Ctr Theoret Phys, I-34151 Trieste, Italy.
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    Ist Nazl Fis Nucl, Trieste Sect, I-34127 Trieste, Italy.
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    Matrivani Inst Expt Res & Educ, Kolkata 700030, W Bengal, India.
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    Univ Trieste, Dept Phys, I-34127 Trieste, Italy;Ist Nazl Fis Nucl, Trieste Sect, I-34127 Trieste, Italy.
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    Ist Nazl Fis Nucl, Torino Sect, I-10125 Turin, Italy.
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    Matrivani Inst Expt Res & Educ, Kolkata 700030, W Bengal, India.
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    Kurchatov Inst, NRC, IHEP, Protvino 142281, Russia.
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    Yamagata Univ, Yamagata 9928510, Japan.
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    Tech Univ Munich, Phys Dept, D-85748 Garching, Germany.
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    Tomsk Polytech Univ, Tomsk 634050, Russia.
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    Warsaw Univ Technol, Inst Radioelect, PL-00665 Warsaw, Poland.
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    Joint Inst Nucl Res, Dubna 141980, Russia.
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    Univ Bonn, Helmholtz Inst Strahlen & Kernphys, D-53115 Bonn, Germany.
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    Univ Paris Saclay, IRFU, CEA, F-91191 Gif Sur Yvette, France.
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    Charles Univ Prague, Fac Math & Phys, Prague 18000, Czech Republic.
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    Charles Univ Prague, Fac Math & Phys, Prague 18000, Czech Republic.
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    Univ Freiburg, Phys Inst, D-79104 Freiburg, Germany.
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    LIP, P-1649003 Lisbon, Portugal.
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    CERN, CH-1211 Geneva 23, Switzerland;Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany.
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    Tech Univ Munich, Phys Dept, D-85748 Garching, Germany.
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    Joint Inst Nucl Res, Dubna 141980, Russia;CERN, CH-1211 Geneva 23, Switzerland.
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    Univ Paris Saclay, IRFU, CEA, F-91191 Gif Sur Yvette, France.
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    Univ Bochum, Inst Expt Phys, D-44780 Bochum, Germany.
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    Joint Inst Nucl Res, Dubna 141980, Russia.
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    Lebedev Phys Inst, Moscow 119991, Russia;Tech Univ Munich, Phys Dept, D-85748 Garching, Germany.
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    Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany.
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    Univ Illinois, Dept Phys, Urbana, IL 61801 USA.
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    Univ Turin, Dept Phys, I-10125 Turin, Italy;Ist Nazl Fis Nucl, Torino Sect, I-10125 Turin, Italy.
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    Univ Freiburg, Phys Inst, D-79104 Freiburg, Germany.
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    Univ Turin, Dept Phys, I-10125 Turin, Italy;Ist Nazl Fis Nucl, Torino Sect, I-10125 Turin, Italy.
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    Joint Inst Nucl Res, Dubna 141980, Russia.
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    Univ Illinois, Dept Phys, Urbana, IL 61801 USA.
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    Tech Univ Munich, Phys Dept, D-85748 Garching, Germany.
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    Univ Freiburg, Phys Inst, D-79104 Freiburg, Germany.
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    Joint Inst Nucl Res, Dubna 141980, Russia.
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    Univ Bonn, Phys Inst, D-53115 Bonn, Germany.
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    Ist Nazl Fis Nucl, Trieste Sect, I-34127 Trieste, Italy.
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    Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany.
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    Univ Freiburg, Phys Inst, D-79104 Freiburg, Germany.
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    Univ Illinois, Dept Phys, Urbana, IL 61801 USA.
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    Univ Freiburg, Phys Inst, D-79104 Freiburg, Germany.
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    Nagoya Univ, Nagoya, Aichi 464, Japan;Chubu Univ, Kasugai, Aichi 4878501, Japan.
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    Univ Paris Saclay, IRFU, CEA, F-91191 Gif Sur Yvette, France.
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    Tech Univ Munich, Phys Dept, D-85748 Garching, Germany.
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    Yamagata Univ, Yamagata 9928510, Japan;KEK, 1-1 Oho, Oho, Ibaraki 3050801, Japan.
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    Univ Turin, Dept Phys, I-10125 Turin, Italy;Ist Nazl Fis Nucl, Torino Sect, I-10125 Turin, Italy.
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    Joint Inst Nucl Res, Dubna 141980, Russia.
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    Yamagata Univ, Yamagata 9928510, Japan.
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    Czech Tech Univ, Prague 16636, Czech Republic.
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    Univ Bonn, Helmholtz Inst Strahlen & Kernphys, D-53115 Bonn, Germany.
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    Univ Freiburg, Phys Inst, D-79104 Freiburg, Germany.
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    Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany.
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    Univ Trieste, Dept Phys, I-34127 Trieste, Italy;Ist Nazl Fis Nucl, Trieste Sect, I-34127 Trieste, Italy.
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    Univ Bonn, Helmholtz Inst Strahlen & Kernphys, D-53115 Bonn, Germany.
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    Kurchatov Inst, NRC, IHEP, Protvino 142281, Russia.
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    Kurchatov Inst, NRC, IHEP, Protvino 142281, Russia;Moscow Inst Phys & Technol, Moscow 141700, Russia.
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    Joint Inst Nucl Res, Dubna 141980, Russia.
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    Univ Bonn, Phys Inst, D-53115 Bonn, Germany.
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    Univ Bochum, Inst Expt Phys, D-44780 Bochum, Germany;Univ Illinois, Dept Phys, Urbana, IL 61801 USA.
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    Kurchatov Inst, NRC, IHEP, Protvino 142281, Russia.
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    Yamagata Univ, Yamagata 9928510, Japan.
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    Univ Freiburg, Phys Inst, D-79104 Freiburg, Germany.
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    Lebedev Phys Inst, Moscow 119991, Russia;Tech Univ Munich, Phys Dept, D-85748 Garching, Germany.
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    Kurchatov Inst, NRC, IHEP, Protvino 142281, Russia.
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    Univ Turin, Dept Phys, I-10125 Turin, Italy;Ist Nazl Fis Nucl, Torino Sect, I-10125 Turin, Italy.
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    Joint Inst Nucl Res, Dubna 141980, Russia.
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    Czech Tech Univ, Prague 16636, Czech Republic.
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    Tech Univ Munich, Phys Dept, D-85748 Garching, Germany.
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    Univ Freiburg, Phys Inst, D-79104 Freiburg, Germany.
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    Tech Univ Munich, Phys Dept, D-85748 Garching, Germany.
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    Joint Inst Nucl Res, Dubna 141980, Russia.
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    Univ Illinois, Dept Phys, Urbana, IL 61801 USA.
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    Univ Paris Saclay, IRFU, CEA, F-91191 Gif Sur Yvette, France.
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    Natl Ctr Nucl Res, PL-00681 Warsaw, Poland.
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    Warsaw Univ Technol, Inst Radioelect, PL-00665 Warsaw, Poland.
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    Tomsk Polytech Univ, Tomsk 634050, Russia.
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    Czech Tech Univ, Prague 16636, Czech Republic.
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    Kurchatov Inst, NRC, IHEP, Protvino 142281, Russia.
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    Tomsk Polytech Univ, Tomsk 634050, Russia.
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    Univ Paris Saclay, IRFU, CEA, F-91191 Gif Sur Yvette, France.
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    Ist Nazl Fis Nucl, Trieste Sect, I-34127 Trieste, Italy.
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    Tel Aviv Univ, Sch Phys & Astron, IL-69978 Tel Aviv, Israel.
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    Univ Turin, Dept Phys, I-10125 Turin, Italy;Ist Nazl Fis Nucl, Torino Sect, I-10125 Turin, Italy.
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    Tomsk Polytech Univ, Tomsk 634050, Russia;Univ Tubingen, Inst Theoret Phys, D-72076 Tubingen, Germany.
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    Ist Nazl Fis Nucl, Torino Sect, I-10125 Turin, Italy.
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    Univ Illinois, Dept Phys, Urbana, IL 61801 USA.
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    Univ Illinois, Dept Phys, Urbana, IL 61801 USA.
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    Ist Nazl Fis Nucl, Trieste Sect, I-34127 Trieste, Italy;Abdus Salam Int Ctr Theoret Phys, I-34151 Trieste, Italy.
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    CERN, CH-1211 Geneva 23, Switzerland.
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    Tomsk Polytech Univ, Tomsk 634050, Russia.
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    Natl Ctr Nucl Res, PL-00681 Warsaw, Poland.
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    Univ Trieste, Dept Phys, I-34127 Trieste, Italy;Ist Nazl Fis Nucl, Trieste Sect, I-34127 Trieste, Italy.
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    Warsaw Univ Technol, Inst Radioelect, PL-00665 Warsaw, Poland.
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    Charles Univ Prague, Fac Math & Phys, Prague 18000, Czech Republic;Univ Trieste, Dept Phys, I-34127 Trieste, Italy;Ist Nazl Fis Nucl, Trieste Sect, I-34127 Trieste, Italy.
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    Yamagata Univ, Yamagata 9928510, Japan.
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    Miyazaki Univ, Miyazaki 8892192, Japan.
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    Joint Inst Nucl Res, Dubna 141980, Russia.
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    Univ Paris Saclay, IRFU, CEA, F-91191 Gif Sur Yvette, France;Univ Illinois, Dept Phys, Urbana, IL 61801 USA.
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    Univ Bochum, Inst Expt Phys, D-44780 Bochum, Germany.
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    Kurchatov Inst, NRC, IHEP, Protvino 142281, Russia.
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    Univ Bonn, Helmholtz Inst Strahlen & Kernphys, D-53115 Bonn, Germany.
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    Joint Inst Nucl Res, Dubna 141980, Russia.
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    Joint Inst Nucl Res, Dubna 141980, Russia.
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    Yamagata Univ, Yamagata 9928510, Japan.
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    Joint Inst Nucl Res, Dubna 141980, Russia.
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    Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany.
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    Univ Paris Saclay, IRFU, CEA, F-91191 Gif Sur Yvette, France.
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    CERN, CH-1211 Geneva 23, Switzerland;Czech Tech Univ, Prague 16636, Czech Republic.
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    Yamagata Univ, Yamagata 9928510, Japan.
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    LIP, P-1649003 Lisbon, Portugal.
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    Joint Inst Nucl Res, Dubna 141980, Russia.
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    Joint Inst Nucl Res, Dubna 141980, Russia.
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    Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany.
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    Ist Nazl Fis Nucl, Torino Sect, I-10125 Turin, Italy;Univ Piemonte Orientale, I-15100 Alessandria, Italy.
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    Univ Turin, Dept Phys, I-10125 Turin, Italy;Ist Nazl Fis Nucl, Torino Sect, I-10125 Turin, Italy.
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    Tech Univ Munich, Phys Dept, D-85748 Garching, Germany.
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    Univ Aveiro, Dept Phys, P-3810193 Aveiro, Portugal.
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    Charles Univ Prague, Fac Math & Phys, Prague 18000, Czech Republic.
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    Charles Univ Prague, Fac Math & Phys, Prague 18000, Czech Republic.
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    Joint Inst Nucl Res, Dubna 141980, Russia.
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    Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany;Univ Paris Saclay, IRFU, CEA, F-91191 Gif Sur Yvette, France.
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    Univ Paris Saclay, IRFU, CEA, F-91191 Gif Sur Yvette, France.
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    Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany.
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    Kurchatov Inst, NRC, IHEP, Protvino 142281, Russia.
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    Univ Bonn, Phys Inst, D-53115 Bonn, Germany;Rhein Westfal TH Aachen, Phys Inst 3, D-52056 Aachen, Germany.
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    LIP, P-1649003 Lisbon, Portugal.
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    LIP, P-1649003 Lisbon, Portugal.
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    LIP, P-1649003 Lisbon, Portugal;Univ Lisbon, Inst Super Tecn, Lisbon, Portugal.
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    Univ Freiburg, Phys Inst, D-79104 Freiburg, Germany.
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    Univ Bochum, Inst Expt Phys, D-44780 Bochum, Germany.
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    Univ Illinois, Dept Phys, Urbana, IL 61801 USA.
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    Joint Inst Nucl Res, Dubna 141980, Russia.
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    Tech Univ Munich, Phys Dept, D-85748 Garching, Germany;Kurchatov Inst, NRC, IHEP, Protvino 142281, Russia.
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    Joint Inst Nucl Res, Dubna 141980, Russia.
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    Warsaw Univ Technol, Inst Radioelect, PL-00665 Warsaw, Poland.
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    Czech Tech Univ, Prague 16636, Czech Republic.
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    Kurchatov Inst, NRC, IHEP, Protvino 142281, Russia.
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    Natl Ctr Nucl Res, PL-00681 Warsaw, Poland.
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    Ist Nazl Fis Nucl, Trieste Sect, I-34127 Trieste, Italy.
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    Matrivani Inst Expt Res & Educ, Kolkata 700030, W Bengal, India.
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    Joint Inst Nucl Res, Dubna 141980, Russia.
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    Acad Sinica, Inst Phys, Taipei 11529, Taiwan.
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    Univ Trieste, Dept Phys, I-34127 Trieste, Italy;Ist Nazl Fis Nucl, Trieste Sect, I-34127 Trieste, Italy.
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    Univ Trieste, Dept Phys, I-34127 Trieste, Italy;Ist Nazl Fis Nucl, Trieste Sect, I-34127 Trieste, Italy.
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    Univ Freiburg, Phys Inst, D-79104 Freiburg, Germany.
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    Univ Bonn, Phys Inst, D-53115 Bonn, Germany.
    Schönning, Karin
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics. CERN, CH-1211 Geneva 23, Switzerland.
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    Univ Paris Saclay, IRFU, CEA, F-91191 Gif Sur Yvette, France.
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    Joint Inst Nucl Res, Dubna 141980, Russia.
    Silva, L.
    LIP, P-1649003 Lisbon, Portugal.
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    Matrivani Inst Expt Res & Educ, Kolkata 700030, W Bengal, India.
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    Univ Freiburg, Phys Inst, D-79104 Freiburg, Germany.
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    Joint Inst Nucl Res, Dubna 141980, Russia.
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    Joint Inst Nucl Res, Dubna 141980, Russia.
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    AS CR, Inst Sci Instruments, Brno 61264, Czech Republic.
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    CERN, CH-1211 Geneva 23, Switzerland;Tech Univ Munich, Phys Dept, D-85748 Garching, Germany.
    Stolarski, M.
    LIP, P-1649003 Lisbon, Portugal.
    Subrt, O.
    CERN, CH-1211 Geneva 23, Switzerland;Czech Tech Univ, Prague 16636, Czech Republic.
    Sulc, M.
    Tech Univ Liberec, Liberec 46117, Czech Republic.
    Suzuki, H.
    Yamagata Univ, Yamagata 9928510, Japan;Chubu Univ, Kasugai, Aichi 4878501, Japan.
    Szabelski, A.
    Univ Trieste, Dept Phys, I-34127 Trieste, Italy;Ist Nazl Fis Nucl, Trieste Sect, I-34127 Trieste, Italy;Natl Ctr Nucl Res, PL-00681 Warsaw, Poland.
    Szameitat, T.
    Univ Freiburg, Phys Inst, D-79104 Freiburg, Germany.
    Sznajder, P.
    Natl Ctr Nucl Res, PL-00681 Warsaw, Poland.
    Tasevsky, M.
    Joint Inst Nucl Res, Dubna 141980, Russia.
    Tessaro, S.
    Ist Nazl Fis Nucl, Trieste Sect, I-34127 Trieste, Italy.
    Tessarotto, F.
    Ist Nazl Fis Nucl, Trieste Sect, I-34127 Trieste, Italy.
    Thiel, A.
    Univ Bonn, Helmholtz Inst Strahlen & Kernphys, D-53115 Bonn, Germany.
    Tomsa, J.
    Charles Univ Prague, Fac Math & Phys, Prague 18000, Czech Republic.
    Tosello, F.
    Ist Nazl Fis Nucl, Torino Sect, I-10125 Turin, Italy.
    Tskhay, V.
    Lebedev Phys Inst, Moscow 119991, Russia.
    Uhl, S.
    Tech Univ Munich, Phys Dept, D-85748 Garching, Germany.
    Vasilishin, B. I.
    Tomsk Polytech Univ, Tomsk 634050, Russia.
    Vauth, A.
    CERN, CH-1211 Geneva 23, Switzerland.
    Veloso, J.
    Univ Aveiro, Dept Phys, P-3810193 Aveiro, Portugal.
    Vidon, A.
    Univ Paris Saclay, IRFU, CEA, F-91191 Gif Sur Yvette, France.
    Virius, M.
    Czech Tech Univ, Prague 16636, Czech Republic.
    Wallner, S.
    Tech Univ Munich, Phys Dept, D-85748 Garching, Germany.
    Weisrock, T.
    Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany.
    Wilfert, M.
    Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany.
    ter Wolbeek, J.
    Univ Freiburg, Phys Inst, D-79104 Freiburg, Germany.
    Zaremba, K.
    Warsaw Univ Technol, Inst Radioelect, PL-00665 Warsaw, Poland.
    Zavada, P.
    Joint Inst Nucl Res, Dubna 141980, Russia.
    Zavertyaev, M.
    Lebedev Phys Inst, Moscow 119991, Russia.
    Zemlyanichkina, E.
    Joint Inst Nucl Res, Dubna 141980, Russia.
    Zhuravlev, N.
    Joint Inst Nucl Res, Dubna 141980, Russia.
    Ziembicki, M.
    Warsaw Univ Technol, Inst Radioelect, PL-00665 Warsaw, Poland.
    Search for muoproduction of X(3872) at COMPASS and indication of a new state (X)over-tilde(3872)2018In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 783, p. 334-340Article in journal (Refereed)
    Abstract [en]

    We have searched for exclusive production of exotic charmonia in the reaction mu N+ -> mu(+)(J/psi pi(+)pi(-))pi N-+/-' using COMPASS data collected with incoming muons of 160 GeV/c and 200 GeV/c momentum. In the J/psi pi(vertical bar)pi mass distribution we observe a signal with a statistical significance of 4.1 sigma. Its mass and width are consistent with those of the X(3872). The shape of the pi(+)pi(-) mass distribution from the observed decay into J/psi pi(+)pi(-) shows disagreement with previous observations for X(3872). The observed signal may be interpreted as a possible evidence of a new charmonium state. It could be associated with a neutral partner of X(3872) with C=-1 predicted by a tetraquark model. The product of cross section and branching fraction of the decay of the observed state into J/psi pi(+)pi(-) is determined to be 71 +/- 28(stat)+/- 39(syst) pb.

  • 3728.
    Aghasyan, M.
    et al.
    INFN, Trieste Sect, I-34127 Trieste, Italy..
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    Univ Turin, Dept Phys, I-10125 Turin, Italy..
    Alexeev, G. D.
    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia..
    Amoroso, A.
    Univ Turin, Dept Phys, I-10125 Turin, Italy.;INFN, Torino Sect, I-10125 Turin, Italy..
    Andrieux, V.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France.;Univ Illinois, Dept Phys, Urbana, IL 61801 USA..
    Anfimov, N. V.
    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia..
    Anosov, V.
    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia..
    Antoshkin, A.
    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia..
    Augsten, K.
    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia.;Czech Tech Univ, Prague 16636, Czech Republic..
    Augustyniak, W.
    Natl Ctr Nucl Res, PL-00681 Warsaw, Poland..
    Austregesilo, A.
    Tech Univ Munich, Phys Dept, D-85748 Garching, Germany..
    Azevedo, C. D. R.
    Univ Aveiro, Dept Phys, P-3810193 Aveiro, Portugal..
    Badelek, B.
    Univ Warsaw, Fac Phys, PL-02093 Warsaw, Poland..
    Balestra, F.
    Univ Turin, Dept Phys, I-10125 Turin, Italy.;INFN, Torino Sect, I-10125 Turin, Italy..
    Ball, M.
    Univ Bonn, Helmholtz Inst Strahlen & Kernphys, D-53115 Bonn, Germany..
    Barth, J.
    Univ Bonn, Phys Inst, D-53115 Bonn, Germany..
    Beck, R.
    Univ Bonn, Helmholtz Inst Strahlen & Kernphys, D-53115 Bonn, Germany..
    Bedfer, Y.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
    Bernhard, J.
    CERN, CH-1211 Geneva 23, Switzerland.;Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany..
    Bicker, K.
    CERN, CH-1211 Geneva 23, Switzerland.;Tech Univ Munich, Phys Dept, D-85748 Garching, Germany..
    Bielert, E. R.
    CERN, CH-1211 Geneva 23, Switzerland..
    Birsa, R.
    INFN, Trieste Sect, I-34127 Trieste, Italy..
    Bodlak, M.
    Charles Univ Prague, Fac Math & Phys, Prague 18000, Czech Republic..
    Bordalo, P.
    LIP, P-1000149 Lisbon, Portugal.;Univ Lisbon, Inst Super Tecn, Lisbon, Portugal..
    Bradamante, F.
    Univ Trieste, Dept Phys, I-34127 Trieste, Italy.;INFN, Trieste Sect, I-34127 Trieste, Italy..
    Bressan, A.
    Univ Trieste, Dept Phys, I-34127 Trieste, Italy.;INFN, Trieste Sect, I-34127 Trieste, Italy..
    Buechele, M.
    Univ Freiberg, Phys Inst, D-79104 Freiburg, Germany..
    Burtsev, V. E.
    Tomsk Polytech Univ, Tomsk 634050, Russia..
    Capozza, L.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
    Chang, W. -C
    Chatterjee, C.
    Matrivani Inst Expt Res & Educ, Kolkata 700030, W Bengal, India..
    Chiosso, M.
    Univ Turin, Dept Phys, I-10125 Turin, Italy.;INFN, Torino Sect, I-10125 Turin, Italy..
    Choi, I.
    Univ Illinois, Dept Phys, Urbana, IL 61801 USA..
    Chumakov, A. G.
    Tomsk Polytech Univ, Tomsk 634050, Russia..
    Chung, S. -U
    Cicuttin, A.
    INFN, Trieste Sect, I-34127 Trieste, Italy.;Abdus Salam Int Ctr Theoret Phys, I-34151 Trieste, Italy..
    Crespo, M. L.
    INFN, Trieste Sect, I-34127 Trieste, Italy.;Abdus Salam Int Ctr Theoret Phys, I-34151 Trieste, Italy..
    Curiel, Q.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
    Dalla Torre, S.
    INFN, Trieste Sect, I-34127 Trieste, Italy..
    Dasgupta, S. S.
    Matrivani Inst Expt Res & Educ, Kolkata 700030, W Bengal, India..
    Dasgupta, S.
    Univ Trieste, Dept Phys, I-34127 Trieste, Italy.;INFN, Trieste Sect, I-34127 Trieste, Italy..
    Denisov, O. Yu.
    INFN, Torino Sect, I-10125 Turin, Italy..
    Dhara, L.
    Matrivani Inst Expt Res & Educ, Kolkata 700030, W Bengal, India..
    Donskov, S. V.
    Natl Res Ctr, Kurchatov Inst, State Sci Ctr Inst High Energy Phys, Protvino 142281, Russia..
    Doshita, N.
    Yamagata Univ, Yamagata 9928510, Japan..
    Dreisbach, Ch.
    Tech Univ Munich, Phys Dept, D-85748 Garching, Germany..
    Duennweber, W.
    Tech Univ Munich, Phys Dept, D-85748 Garching, Germany..
    Dusaev, R. R.
    Tomsk Polytech Univ, Tomsk 634050, Russia..
    Dziewiecki, M.
    Warsaw Univ Technol, Inst Radioelect, PL-00665 Warsaw, Poland..
    Efremov, A.
    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia..
    Eversheim, P. D.
    Univ Bonn, Helmholtz Inst Strahlen & Kernphys, D-53115 Bonn, Germany..
    Faessler, M.
    Tech Univ Munich, Phys Dept, D-85748 Garching, Germany..
    Ferrero, A.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
    Finger, M.
    Charles Univ Prague, Fac Math & Phys, Prague 18000, Czech Republic..
    Finger, M., Jr.
    Charles Univ Prague, Fac Math & Phys, Prague 18000, Czech Republic..
    Fischer, H.
    Univ Freiberg, Phys Inst, D-79104 Freiburg, Germany..
    Franco, C.
    LIP, P-1000149 Lisbon, Portugal..
    von Hohenesche, N. du Fresne
    CERN, CH-1211 Geneva 23, Switzerland.;Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany..
    Friedrich, J. M.
    Tech Univ Munich, Phys Dept, D-85748 Garching, Germany..
    Frolov, V.
    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia.;CERN, CH-1211 Geneva 23, Switzerland..
    Fuchey, E.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
    Gautheron, F.
    Univ Bochum, Inst Expt Phys, D-44780 Bochum, Germany..
    Gavrichtchouk, O. P.
    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia..
    Gerassimov, S.
    Lebedev Phys Inst, Moscow 119991, Russia.;Tech Univ Munich, Phys Dept, D-85748 Garching, Germany..
    Giarra, J.
    Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany..
    Giordano, F.
    Univ Illinois, Dept Phys, Urbana, IL 61801 USA..
    Gnesi, I.
    Univ Turin, Dept Phys, I-10125 Turin, Italy.;INFN, Torino Sect, I-10125 Turin, Italy..
    Gorzellik, M.
    Univ Freiberg, Phys Inst, D-79104 Freiburg, Germany..
    Grasso, A.
    Univ Turin, Dept Phys, I-10125 Turin, Italy.;INFN, Torino Sect, I-10125 Turin, Italy..
    Gridin, A.
    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia..
    Perdekamp, M. Grosse
    Univ Illinois, Dept Phys, Urbana, IL 61801 USA..
    Grube, B.
    Tech Univ Munich, Phys Dept, D-85748 Garching, Germany..
    Grussenmeyer, T.
    Univ Freiberg, Phys Inst, D-79104 Freiburg, Germany..
    Guskov, A.
    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia..
    Hahne, D.
    Univ Bonn, Phys Inst, D-53115 Bonn, Germany..
    Hamar, G.
    INFN, Trieste Sect, I-34127 Trieste, Italy..
    von Harrach, D.
    Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany..
    Heinsius, F. H.
    Univ Freiberg, Phys Inst, D-79104 Freiburg, Germany..
    Heitz, R.
    Univ Illinois, Dept Phys, Urbana, IL 61801 USA..
    Herrmann, F.
    Univ Freiberg, Phys Inst, D-79104 Freiburg, Germany..
    Horikawa, N.
    Nagoya Univ, Nagoya, Aichi 464, Japan.;Chubu Univ, Kasugai, Aichi 4878501, Japan..
    d'Hose, N.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
    Hsieh, C. -Y
    Huber, S.
    Tech Univ Munich, Phys Dept, D-85748 Garching, Germany..
    Ishimoto, S.
    Yamagata Univ, Yamagata 9928510, Japan.;KEK, 1-1 Oho, Tsukuba, Ibaraki 3050801, Japan..
    Ivanov, A.
    Univ Turin, Dept Phys, I-10125 Turin, Italy.;INFN, Torino Sect, I-10125 Turin, Italy..
    Iwata, T.
    Yamagata Univ, Yamagata 9928510, Japan..
    Jary, V.
    Czech Tech Univ, Prague 16636, Czech Republic..
    Joosten, R.
    Univ Bonn, Helmholtz Inst Strahlen & Kernphys, D-53115 Bonn, Germany..
    Joerg, P.
    Univ Freiberg, Phys Inst, D-79104 Freiburg, Germany..
    Kabuss, E.
    Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany..
    Kerbizi, A.
    Univ Trieste, Dept Phys, I-34127 Trieste, Italy.;INFN, Trieste Sect, I-34127 Trieste, Italy..
    Ketzer, B.
    Univ Bonn, Helmholtz Inst Strahlen & Kernphys, D-53115 Bonn, Germany..
    Khaustov, G. V.
    Natl Res Ctr, Kurchatov Inst, State Sci Ctr Inst High Energy Phys, Protvino 142281, Russia..
    Khokhlov, Yu. A.
    Natl Res Ctr, Kurchatov Inst, State Sci Ctr Inst High Energy Phys, Protvino 142281, Russia.;Moscow Inst Phys & Technol, Dolgoprudnyi 141700, Moscow Region, Russia..
    Kisselev, Yu.
    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia..
    Klein, F.
    Univ Bonn, Phys Inst, D-53115 Bonn, Germany..
    Koivuniemi, J. H.
    Univ Bochum, Inst Expt Phys, D-44780 Bochum, Germany.;Univ Illinois, Dept Phys, Urbana, IL 61801 USA..
    Kolosov, V. N.
    Natl Res Ctr, Kurchatov Inst, State Sci Ctr Inst High Energy Phys, Protvino 142281, Russia..
    Kondo, K.
    Yamagata Univ, Yamagata 9928510, Japan..
    Koenigsmann, K.
    Univ Freiberg, Phys Inst, D-79104 Freiburg, Germany..
    Konorov, I.
    Lebedev Phys Inst, Moscow 119991, Russia.;Tech Univ Munich, Phys Dept, D-85748 Garching, Germany..
    Konstantinov, V. F.
    Natl Res Ctr, Kurchatov Inst, State Sci Ctr Inst High Energy Phys, Protvino 142281, Russia..
    Kotzinian, A. M.
    INFN, Torino Sect, I-10125 Turin, Italy.;Yerevan Phys Inst, Alikhanian Br St, Yerevan 0036, Armenia..
    Kouznetsov, O. M.
    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia..
    Kral, Z.
    Czech Tech Univ, Prague 16636, Czech Republic..
    Kraemer, M.
    Tech Univ Munich, Phys Dept, D-85748 Garching, Germany..
    Kremser, P.
    Univ Freiberg, Phys Inst, D-79104 Freiburg, Germany..
    Krinner, F.
    Tech Univ Munich, Phys Dept, D-85748 Garching, Germany..
    Kroumchtein, Z. V.
    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia..
    Kulinich, Y.
    Univ Illinois, Dept Phys, Urbana, IL 61801 USA..
    Kunne, F.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
    Kurek, K.
    Natl Ctr Nucl Res, PL-00681 Warsaw, Poland..
    Kurjata, R. P.
    Warsaw Univ Technol, Inst Radioelect, PL-00665 Warsaw, Poland..
    Kuznetsov, I. I.
    Tomsk Polytech Univ, Tomsk 634050, Russia..
    Kveton, A.
    Czech Tech Univ, Prague 16636, Czech Republic..
    Lednev, A. A.
    Natl Res Ctr, Kurchatov Inst, State Sci Ctr Inst High Energy Phys, Protvino 142281, Russia..
    Levchenko, E. A.
    Tomsk Polytech Univ, Tomsk 634050, Russia..
    Levillain, M.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
    Levorato, S.
    INFN, Trieste Sect, I-34127 Trieste, Italy..
    Lian, Y. -S
    Lichtenstadt, J.
    Tel Aviv Univ, Sch Phys & Astron, IL-69978 Tel Aviv, Israel..
    Longo, R.
    Univ Turin, Dept Phys, I-10125 Turin, Italy.;INFN, Torino Sect, I-10125 Turin, Italy..
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    Tomsk Polytech Univ, Tomsk 634050, Russia..
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    INFN, Torino Sect, I-10125 Turin, Italy..
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    Univ Illinois, Dept Phys, Urbana, IL 61801 USA..
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    Univ Illinois, Dept Phys, Urbana, IL 61801 USA..
    Makke, N.
    INFN, Trieste Sect, I-34127 Trieste, Italy.;Abdus Salam Int Ctr Theoret Phys, I-34151 Trieste, Italy..
    Mallot, G. K.
    CERN, CH-1211 Geneva 23, Switzerland..
    Mamon, S. A.
    Tomsk Polytech Univ, Tomsk 634050, Russia..
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    Natl Ctr Nucl Res, PL-00681 Warsaw, Poland..
    Martin, A.
    Univ Trieste, Dept Phys, I-34127 Trieste, Italy.;INFN, Trieste Sect, I-34127 Trieste, Italy..
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    Warsaw Univ Technol, Inst Radioelect, PL-00665 Warsaw, Poland..
    Matousek, J.
    Charles Univ Prague, Fac Math & Phys, Prague 18000, Czech Republic.;Univ Trieste, Dept Phys, I-34127 Trieste, Italy.;INFN, Trieste Sect, I-34127 Trieste, Italy..
    Matsuda, H.
    Yamagata Univ, Yamagata 9928510, Japan..
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    Univ Miyazaki, Miyazaki 8892192, Japan..
    Meshcheryakov, G. V.
    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia..
    Meyer, M.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France.;Univ Illinois, Dept Phys, Urbana, IL 61801 USA..
    Meyer, W.
    Univ Bochum, Inst Expt Phys, D-44780 Bochum, Germany..
    Mikhailov, Yu. V.
    Natl Res Ctr, Kurchatov Inst, State Sci Ctr Inst High Energy Phys, Protvino 142281, Russia..
    Mikhasenko, M.
    Univ Bonn, Helmholtz Inst Strahlen & Kernphys, D-53115 Bonn, Germany..
    Mitrofanov, E.
    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia..
    Mitrofanov, N.
    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia..
    Miyachi, Y.
    Yamagata Univ, Yamagata 9928510, Japan..
    Moretti, A.
    Univ Trieste, Dept Phys, I-34127 Trieste, Italy.;INFN, Trieste Sect, I-34127 Trieste, Italy..
    Nagaytsev, A.
    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia..
    Nerling, F.
    Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany..
    Neyret, D.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
    Novy, J.
    CERN, CH-1211 Geneva 23, Switzerland.;Czech Tech Univ, Prague 16636, Czech Republic..
    Nowak, W. -D
    Nukazuka, G.
    Yamagata Univ, Yamagata 9928510, Japan..
    Nunes, A. S.
    LIP, P-1000149 Lisbon, Portugal..
    Olshevsky, A. G.
    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia..
    Orlov, I.
    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia..
    Ostrick, M.
    Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany..
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    INFN, Torino Sect, I-10125 Turin, Italy.;Univ Piemonte Orientale, I-15100 Alessandria, Italy..
    Parsamyan, B.
    Univ Turin, Dept Phys, I-10125 Turin, Italy.;INFN, Torino Sect, I-10125 Turin, Italy..
    Paul, S.
    Tech Univ Munich, Phys Dept, D-85748 Garching, Germany..
    Peng, J. -C
    Pereira, F.
    Univ Aveiro, Dept Phys, P-3810193 Aveiro, Portugal..
    Pesek, M.
    Charles Univ Prague, Fac Math & Phys, Prague 18000, Czech Republic..
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    Charles Univ Prague, Fac Math & Phys, Prague 18000, Czech Republic..
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    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia..
    Pierre, N.
    Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany.;Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
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    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
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    Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany..
    Polyakov, V. A.
    Natl Res Ctr, Kurchatov Inst, State Sci Ctr Inst High Energy Phys, Protvino 142281, Russia..
    Pretz, J.
    Univ Bonn, Phys Inst, D-53115 Bonn, Germany.;Rhein Westfal TH Aachen, Phys Inst 3, D-52056 Aachen, Germany..
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    LIP, P-1000149 Lisbon, Portugal..
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    LIP, P-1000149 Lisbon, Portugal..
    Ramos, S.
    LIP, P-1000149 Lisbon, Portugal.;Univ Lisbon, Inst Super Tecn, Lisbon, Portugal..
    Regali, C.
    Univ Freiberg, Phys Inst, D-79104 Freiburg, Germany..
    Reicherz, G.
    Univ Bochum, Inst Expt Phys, D-44780 Bochum, Germany..
    Riedl, C.
    Univ Illinois, Dept Phys, Urbana, IL 61801 USA..
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    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia..
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    Tech Univ Munich, Phys Dept, D-85748 Garching, Germany.;Natl Res Ctr, Kurchatov Inst, State Sci Ctr Inst High Energy Phys, Protvino 142281, Russia..
    Rybnikov, A.
    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia..
    Rychter, A.
    Warsaw Univ Technol, Inst Radioelect, PL-00665 Warsaw, Poland..
    Salac, R.
    Czech Tech Univ, Prague 16636, Czech Republic..
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    Natl Res Ctr, Kurchatov Inst, State Sci Ctr Inst High Energy Phys, Protvino 142281, Russia..
    Sandacz, A.
    Natl Ctr Nucl Res, PL-00681 Warsaw, Poland..
    Santos, C.
    INFN, Trieste Sect, I-34127 Trieste, Italy..
    Sarkar, S.
    Matrivani Inst Expt Res & Educ, Kolkata 700030, W Bengal, India..
    Savin, I. A.
    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia..
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    Acad Sinica, Inst Phys, Taipei 11529, Taiwan..
    Sbrizzai, G.
    Univ Trieste, Dept Phys, I-34127 Trieste, Italy.;INFN, Trieste Sect, I-34127 Trieste, Italy..
    Schiavon, P.
    Univ Trieste, Dept Phys, I-34127 Trieste, Italy.;INFN, Trieste Sect, I-34127 Trieste, Italy..
    Schmidt, K.
    Univ Freiberg, Phys Inst, D-79104 Freiburg, Germany..
    Schmieden, H.
    Univ Bonn, Phys Inst, D-53115 Bonn, Germany..
    Schönning, Karin
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics. CERN, CH-1211 Geneva 23, Switzerland..
    Seder, E.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
    Selyunin, A.
    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia..
    Silva, L.
    LIP, P-1000149 Lisbon, Portugal..
    Sinha, L.
    Matrivani Inst Expt Res & Educ, Kolkata 700030, W Bengal, India..
    Sirtl, S.
    Univ Freiberg, Phys Inst, D-79104 Freiburg, Germany..
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    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia..
    Smolik, J.
    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia..
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    AS CR, Inst Sci Instruments, Brno 61264, Czech Republic..
    Steffen, D.
    CERN, CH-1211 Geneva 23, Switzerland.;Tech Univ Munich, Phys Dept, D-85748 Garching, Germany..
    Stolarski, M.
    LIP, P-1000149 Lisbon, Portugal..
    Subrt, O.
    CERN, CH-1211 Geneva 23, Switzerland.;Czech Tech Univ, Prague 16636, Czech Republic..
    Sulc, M.
    Tech Univ Liberec, Liberec 46117, Czech Republic..
    Suzuki, H.
    Yamagata Univ, Yamagata 9928510, Japan.;Chubu Univ, Kasugai, Aichi 4878501, Japan..
    Szabelski, A.
    Univ Trieste, Dept Phys, I-34127 Trieste, Italy.;INFN, Trieste Sect, I-34127 Trieste, Italy.;Natl Ctr Nucl Res, PL-00681 Warsaw, Poland..
    Szameitat, T.
    Univ Freiberg, Phys Inst, D-79104 Freiburg, Germany..
    Sznajder, P.
    Natl Ctr Nucl Res, PL-00681 Warsaw, Poland..
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    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia..
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    INFN, Trieste Sect, I-34127 Trieste, Italy..
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    INFN, Trieste Sect, I-34127 Trieste, Italy..
    Thiel, A.
    Univ Bonn, Helmholtz Inst Strahlen & Kernphys, D-53115 Bonn, Germany..
    Tomsa, J.
    Charles Univ Prague, Fac Math & Phys, Prague 18000, Czech Republic..
    Tosello, F.
    INFN, Torino Sect, I-10125 Turin, Italy..
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    Lebedev Phys Inst, Moscow 119991, Russia..
    Uhl, S.
    Tech Univ Munich, Phys Dept, D-85748 Garching, Germany..
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    Tomsk Polytech Univ, Tomsk 634050, Russia..
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    CERN, CH-1211 Geneva 23, Switzerland..
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    Univ Aveiro, Dept Phys, P-3810193 Aveiro, Portugal..
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    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
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    Czech Tech Univ, Prague 16636, Czech Republic..
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    Tech Univ Munich, Phys Dept, D-85748 Garching, Germany..
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    Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany..
    Wilfert, M.
    Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany..
    ter Wolbeek, J.
    Univ Freiberg, Phys Inst, D-79104 Freiburg, Germany..
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    Warsaw Univ Technol, Inst Radioelect, PL-00665 Warsaw, Poland..
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    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia..
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    Lebedev Phys Inst, Moscow 119991, Russia..
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    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia..
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    Warsaw Univ Technol, Inst Radioelect, PL-00665 Warsaw, Poland..
    Transverse-momentum-dependent multiplicities of charged hadrons in muon-deuteron deep inelastic scattering2018In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 97, no 3, article id 032006Article in journal (Refereed)
    Abstract [en]

    A semi-inclusive measurement of charged hadron multiplicities in deep inelastic muon scattering off an isoscalar target was performed using data collected by the COMPASS Collaboration at CERN. The following kinematic domain is covered by the data: photon virtuality Q(2) > 1 (GeV/c)(2), invariant mass of the hadronic system W > 5 (GeV/c)(2), Bjorken scaling variable in the range 0.003 < x < 0.4, fraction of the virtual photon energy carried by the hadron in the range 0.2 < z < 0.8, and square of the hadron transverse momentum with respect to the virtual photon direction in the range 0.02 (GeV/c)(2) < P-hT(2) < 3 (GeV/c)(2). The multiplicities are presented as a function of P-hT(2) in three-dimensional bins of x, Q(2), z and compared to previous semi-inclusive measurements. We explore the small-P-hT(2) region, i.e. P-hT(2) < 1 (GeV/c)(2), where hadron transverse momenta are expected to arise from nonperturbative effects, and also the domain of larger P-hT(2), where contributions from higher-order perturbative QCD are expected to dominate. The multiplicities are fitted using a single-exponential function at small P-hT(2) to study the dependence of the average transverse momentum < P-hT(2)> on x, Q(2) and z. The power-law behavior of the multiplicities at large P-hT(2) is investigated using various functional forms. The fits describe the data reasonably well over the full measured range.

  • 3729.
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    INFN, Trieste Sect, I-34127 Trieste, Italy.
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    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia.
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    Tel Aviv Univ, Sch Phys & Astron, IL-69978 Tel Aviv, Israel;Univ Turin, Dept Phys, I-10125 Turin, Italy;INFN, Torino Sect, I-10125 Turin, Italy.
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    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France;Univ Illinois, Dept Phys, Urbana, IL 61801 USA.
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    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia.
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    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia.
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    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia.
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    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia;Czech Tech Univ, Prague 16636, Czech Republic.
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    Natl Ctr Nucl Res, PL-00681 Warsaw, Poland.
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    Tech Univ Munich, Phys Dept, D-85748 Garching, Germany.
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    Univ Aveiro, Dept Phys, P-3810193 Aveiro, Portugal.
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    Univ Warsaw, Fac Phys, PL-02093 Warsaw, Poland.
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    Tel Aviv Univ, Sch Phys & Astron, IL-69978 Tel Aviv, Israel;Univ Turin, Dept Phys, I-10125 Turin, Italy;INFN, Torino Sect, I-10125 Turin, Italy.
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    Univ Bonn, Helmholtz Inst Strahlen & Kernphys, D-53115 Bonn, Germany.
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    Univ Bonn, Phys Inst, D-53115 Bonn, Germany.
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    Univ Bonn, Helmholtz Inst Strahlen & Kernphys, D-53115 Bonn, Germany.
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    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France.
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    CERN, CH-1211 Geneva 23, Switzerland;Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany.
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    CERN, CH-1211 Geneva 23, Switzerland;Tech Univ Munich, Phys Dept, D-85748 Garching, Germany.
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    CERN, CH-1211 Geneva 23, Switzerland.
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    INFN, Trieste Sect, I-34127 Trieste, Italy.
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    Charles Univ Prague, Fac Math & Phys, CR-18000 Prague, Czech Republic.
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    LIP, P-1000149 Lisbon, Portugal;Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany.
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    Univ Trieste, Dept Phys, I-34127 Trieste, Italy;INFN, Trieste Sect, I-34127 Trieste, Italy.
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    Univ Trieste, Dept Phys, I-34127 Trieste, Italy;INFN, Trieste Sect, I-34127 Trieste, Italy.
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    Univ Freiburg, Phys Inst, D-79104 Freiburg, Germany.
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    Tomsk Polytech Univ, Tomsk 634050, Russia.
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    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France.
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    Matrivani Inst Expt Res & Educ, Kolkata 700030, W Bengal, India.
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    Tel Aviv Univ, Sch Phys & Astron, IL-69978 Tel Aviv, Israel;Univ Turin, Dept Phys, I-10125 Turin, Italy;INFN, Torino Sect, I-10125 Turin, Italy.
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    Univ Illinois, Dept Phys, Urbana, IL 61801 USA.
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    Tomsk Polytech Univ, Tomsk 634050, Russia.
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    INFN, Trieste Sect, I-34127 Trieste, Italy;Abdus Salam Int Ctr Theoret Phys, I-34151 Trieste, Italy.
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    INFN, Trieste Sect, I-34127 Trieste, Italy;Abdus Salam Int Ctr Theoret Phys, I-34151 Trieste, Italy.
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    INFN, Trieste Sect, I-34127 Trieste, Italy.
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    Matrivani Inst Expt Res & Educ, Kolkata 700030, W Bengal, India.
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    Univ Trieste, Dept Phys, I-34127 Trieste, Italy;INFN, Trieste Sect, I-34127 Trieste, Italy.
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    INFN, Torino Sect, I-10125 Turin, Italy.
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    Matrivani Inst Expt Res & Educ, Kolkata 700030, W Bengal, India.
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    Natl Res Ctr Kurchatov Inst, State Sci Ctr Inst High Energy Phys, Protvino 142281, Russia.
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    Yamagata Univ, Yamagata 9928510, Japan.
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    Tech Univ Munich, Phys Dept, D-85748 Garching, Germany.
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    Tomsk Polytech Univ, Tomsk 634050, Russia.
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    Warsaw Univ Technol, Inst Radioelect, PL-00665 Warsaw, Poland.
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    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia.
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    Univ Bonn, Helmholtz Inst Strahlen & Kernphys, D-53115 Bonn, Germany.
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    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France.
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    Charles Univ Prague, Fac Math & Phys, CR-18000 Prague, Czech Republic.
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    Charles Univ Prague, Fac Math & Phys, CR-18000 Prague, Czech Republic.
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    Univ Freiburg, Phys Inst, D-79104 Freiburg, Germany.
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    LIP, P-1000149 Lisbon, Portugal.
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    CERN, CH-1211 Geneva 23, Switzerland;Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany.
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    Tech Univ Munich, Phys Dept, D-85748 Garching, Germany.
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    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia;CERN, CH-1211 Geneva 23, Switzerland.
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    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France.
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    Univ Bochum, Inst Expt Phys, D-44780 Bochum, Germany.
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    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia.
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    Lebedev Phys Inst, Moscow 119991, Russia;Tech Univ Munich, Phys Dept, D-85748 Garching, Germany;Acad Sinica, Inst Phys, Taipei 11529, Taiwan.
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    Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany.
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    Univ Illinois, Dept Phys, Urbana, IL 61801 USA.
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    Tel Aviv Univ, Sch Phys & Astron, IL-69978 Tel Aviv, Israel;Univ Turin, Dept Phys, I-10125 Turin, Italy;INFN, Torino Sect, I-10125 Turin, Italy.
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    Univ Freiburg, Phys Inst, D-79104 Freiburg, Germany.
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    Tel Aviv Univ, Sch Phys & Astron, IL-69978 Tel Aviv, Israel;Univ Turin, Dept Phys, I-10125 Turin, Italy;INFN, Torino Sect, I-10125 Turin, Italy.
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    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia.
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    Univ Illinois, Dept Phys, Urbana, IL 61801 USA.
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    Tech Univ Munich, Phys Dept, D-85748 Garching, Germany.
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    Univ Freiburg, Phys Inst, D-79104 Freiburg, Germany.
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    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia.
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    Univ Bonn, Phys Inst, D-53115 Bonn, Germany.
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    INFN, Trieste Sect, I-34127 Trieste, Italy.
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    Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany.
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    Univ Freiburg, Phys Inst, D-79104 Freiburg, Germany.
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    Univ Illinois, Dept Phys, Urbana, IL 61801 USA.
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    Univ Freiburg, Phys Inst, D-79104 Freiburg, Germany.
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    Nagoya Univ, Nagoya, Aichi 464, Japan;Chubu Univ, Kasugai, Aichi 4878501, Japan.
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    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France.
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    Tech Univ Munich, Phys Dept, D-85748 Garching, Germany.
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    Yamagata Univ, Yamagata 9928510, Japan;KEK, 1-1 Oho, Tsukuba, Ibaraki 3050801, Japan.
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    Tel Aviv Univ, Sch Phys & Astron, IL-69978 Tel Aviv, Israel;Univ Turin, Dept Phys, I-10125 Turin, Italy;INFN, Torino Sect, I-10125 Turin, Italy.
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    Yamagata Univ, Yamagata 9928510, Japan.
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    Czech Tech Univ, Prague 16636, Czech Republic.
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    Univ Bonn, Helmholtz Inst Strahlen & Kernphys, D-53115 Bonn, Germany.
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    Univ Freiburg, Phys Inst, D-79104 Freiburg, Germany.
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    Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany.
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    Univ Trieste, Dept Phys, I-34127 Trieste, Italy;INFN, Trieste Sect, I-34127 Trieste, Italy.
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    Univ Bonn, Helmholtz Inst Strahlen & Kernphys, D-53115 Bonn, Germany.
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    Natl Res Ctr Kurchatov Inst, State Sci Ctr Inst High Energy Phys, Protvino 142281, Russia.
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    Natl Res Ctr Kurchatov Inst, State Sci Ctr Inst High Energy Phys, Protvino 142281, Russia;Moscow Inst Phys & Technol, Dolgoprudnyi 141700, Moscow Region, Russia.
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    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia.
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    Univ Bonn, Phys Inst, D-53115 Bonn, Germany.
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    Univ Bochum, Inst Expt Phys, D-44780 Bochum, Germany;Univ Illinois, Dept Phys, Urbana, IL 61801 USA.
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    Natl Res Ctr Kurchatov Inst, State Sci Ctr Inst High Energy Phys, Protvino 142281, Russia.
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    Yamagata Univ, Yamagata 9928510, Japan.
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    Univ Freiburg, Phys Inst, D-79104 Freiburg, Germany.
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    Lebedev Phys Inst, Moscow 119991, Russia;Tech Univ Munich, Phys Dept, D-85748 Garching, Germany;Acad Sinica, Inst Phys, Taipei 11529, Taiwan.
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    Natl Res Ctr Kurchatov Inst, State Sci Ctr Inst High Energy Phys, Protvino 142281, Russia.
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    INFN, Torino Sect, I-10125 Turin, Italy;Yerevan Phys Inst, Alikhanian Br St, Yerevan 0036, Armenia.
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    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia.
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    Czech Tech Univ, Prague 16636, Czech Republic.
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    Tech Univ Munich, Phys Dept, D-85748 Garching, Germany.
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    Univ Freiburg, Phys Inst, D-79104 Freiburg, Germany.
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    Tech Univ Munich, Phys Dept, D-85748 Garching, Germany.
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    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia.
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    Univ Illinois, Dept Phys, Urbana, IL 61801 USA.
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    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France.
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    Natl Ctr Nucl Res, PL-00681 Warsaw, Poland.
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    Warsaw Univ Technol, Inst Radioelect, PL-00665 Warsaw, Poland.
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    Tomsk Polytech Univ, Tomsk 634050, Russia.
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    Czech Tech Univ, Prague 16636, Czech Republic.
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    Natl Res Ctr Kurchatov Inst, State Sci Ctr Inst High Energy Phys, Protvino 142281, Russia.
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    Tomsk Polytech Univ, Tomsk 634050, Russia.
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    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France.
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    INFN, Trieste Sect, I-34127 Trieste, Italy.
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    Tel Aviv Univ, Sch Phys & Astron, IL-69978 Tel Aviv, Israel;Univ Turin, Dept Phys, I-10125 Turin, Italy;INFN, Torino Sect, I-10125 Turin, Italy.
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    Tomsk Polytech Univ, Tomsk 634050, Russia;Univ Tubingen, Inst Theoret Phys, D-72076 Tubingen, Germany.
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    INFN, Torino Sect, I-10125 Turin, Italy.
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    Univ Illinois, Dept Phys, Urbana, IL 61801 USA.
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    INFN, Trieste Sect, I-34127 Trieste, Italy;Abdus Salam Int Ctr Theoret Phys, I-34151 Trieste, Italy.
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    CERN, CH-1211 Geneva 23, Switzerland.
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    Tomsk Polytech Univ, Tomsk 634050, Russia.
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    Natl Ctr Nucl Res, PL-00681 Warsaw, Poland.
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    Univ Trieste, Dept Phys, I-34127 Trieste, Italy;INFN, Trieste Sect, I-34127 Trieste, Italy.
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    Warsaw Univ Technol, Inst Radioelect, PL-00665 Warsaw, Poland.
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    Charles Univ Prague, Fac Math & Phys, CR-18000 Prague, Czech Republic;Univ Trieste, Dept Phys, I-34127 Trieste, Italy;INFN, Trieste Sect, I-34127 Trieste, Italy.
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    Yamagata Univ, Yamagata 9928510, Japan.
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    Univ Miyazaki, Miyazaki 8892192, Japan.
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    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia.
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    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France;Univ Illinois, Dept Phys, Urbana, IL 61801 USA.
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    Univ Bochum, Inst Expt Phys, D-44780 Bochum, Germany.
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    Natl Res Ctr Kurchatov Inst, State Sci Ctr Inst High Energy Phys, Protvino 142281, Russia.
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    Univ Bonn, Helmholtz Inst Strahlen & Kernphys, D-53115 Bonn, Germany.
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    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia.
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    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia.
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    Yamagata Univ, Yamagata 9928510, Japan.
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    Univ Trieste, Dept Phys, I-34127 Trieste, Italy;INFN, Trieste Sect, I-34127 Trieste, Italy.
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    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia.
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    Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany.
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    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France.
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    CERN, CH-1211 Geneva 23, Switzerland;Czech Tech Univ, Prague 16636, Czech Republic.
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    Nukazuka, G.
    Yamagata Univ, Yamagata 9928510, Japan.
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    LIP, P-1000149 Lisbon, Portugal.
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    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia.
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    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia.
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    Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany.
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    INFN, Torino Sect, I-10125 Turin, Italy;Univ Piemonte Orientale, I-15100 Alessandria, Italy.
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    Tel Aviv Univ, Sch Phys & Astron, IL-69978 Tel Aviv, Israel;Univ Turin, Dept Phys, I-10125 Turin, Italy;INFN, Torino Sect, I-10125 Turin, Italy.
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    Tech Univ Munich, Phys Dept, D-85748 Garching, Germany.
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    Univ Aveiro, Dept Phys, P-3810193 Aveiro, Portugal.
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    Charles Univ Prague, Fac Math & Phys, CR-18000 Prague, Czech Republic.
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    Charles Univ Prague, Fac Math & Phys, CR-18000 Prague, Czech Republic.
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    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia.
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    Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany;Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France.
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    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France.
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    Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany.
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    Natl Res Ctr Kurchatov Inst, State Sci Ctr Inst High Energy Phys, Protvino 142281, Russia.
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    Univ Bonn, Phys Inst, D-53115 Bonn, Germany;Rhein Westfal TH Aachen, Phys Inst 3, D-52056 Aachen, Germany.
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    LIP, P-1000149 Lisbon, Portugal.
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    LIP, P-1000149 Lisbon, Portugal.
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    LIP, P-1000149 Lisbon, Portugal;Univ Lisbon, Inst Super Tecn, Lisbon, Portugal.
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    Univ Freiburg, Phys Inst, D-79104 Freiburg, Germany.
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    Univ Bochum, Inst Expt Phys, D-44780 Bochum, Germany.
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    Univ Illinois, Dept Phys, Urbana, IL 61801 USA.
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    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia.
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    Tech Univ Munich, Phys Dept, D-85748 Garching, Germany;Natl Res Ctr Kurchatov Inst, State Sci Ctr Inst High Energy Phys, Protvino 142281, Russia.
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    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia.
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    Warsaw Univ Technol, Inst Radioelect, PL-00665 Warsaw, Poland.
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    Czech Tech Univ, Prague 16636, Czech Republic.
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    Natl Res Ctr Kurchatov Inst, State Sci Ctr Inst High Energy Phys, Protvino 142281, Russia.
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    Natl Ctr Nucl Res, PL-00681 Warsaw, Poland.
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    INFN, Trieste Sect, I-34127 Trieste, Italy.
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    Matrivani Inst Expt Res & Educ, Kolkata 700030, W Bengal, India.
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    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia.
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    Sbrizzai, G.
    Univ Trieste, Dept Phys, I-34127 Trieste, Italy;INFN, Trieste Sect, I-34127 Trieste, Italy.
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    Univ Trieste, Dept Phys, I-34127 Trieste, Italy;INFN, Trieste Sect, I-34127 Trieste, Italy.
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    Univ Freiburg, Phys Inst, D-79104 Freiburg, Germany.
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    Univ Bonn, Phys Inst, D-53115 Bonn, Germany.
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    CERN, CH-1211 Geneva 23, Switzerland.
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    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France.
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    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia.
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    LIP, P-1000149 Lisbon, Portugal.
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    Matrivani Inst Expt Res & Educ, Kolkata 700030, W Bengal, India.
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    Univ Freiburg, Phys Inst, D-79104 Freiburg, Germany.
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    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia.
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    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia.
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    AS CR, Inst Sci Instruments, Brno 61264, Czech Republic.
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    CERN, CH-1211 Geneva 23, Switzerland;Tech Univ Munich, Phys Dept, D-85748 Garching, Germany.
    Stolarski, M.
    LIP, P-1000149 Lisbon, Portugal.
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    CERN, CH-1211 Geneva 23, Switzerland;Czech Tech Univ, Prague 16636, Czech Republic.
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    Tech Univ Liberec, Liberec 46117, Czech Republic.
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    Yamagata Univ, Yamagata 9928510, Japan;Chubu Univ, Kasugai, Aichi 4878501, Japan.
    Szabelski, A.
    Univ Trieste, Dept Phys, I-34127 Trieste, Italy;INFN, Trieste Sect, I-34127 Trieste, Italy;Natl Ctr Nucl Res, PL-00681 Warsaw, Poland.
    Szameitat, T.
    Univ Freiburg, Phys Inst, D-79104 Freiburg, Germany.
    Sznajder, P.
    Natl Ctr Nucl Res, PL-00681 Warsaw, Poland.
    Tasevsky, M.
    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia.
    Tessaro, S.
    INFN, Trieste Sect, I-34127 Trieste, Italy.
    Tessarotto, F.
    INFN, Trieste Sect, I-34127 Trieste, Italy.
    Thiel, A.
    Univ Bonn, Helmholtz Inst Strahlen & Kernphys, D-53115 Bonn, Germany.
    Tomsa, J.
    Charles Univ Prague, Fac Math & Phys, CR-18000 Prague, Czech Republic.
    Tosello, F.
    INFN, Torino Sect, I-10125 Turin, Italy.
    Tskhay, V.
    Lebedev Phys Inst, Moscow 119991, Russia;Acad Sinica, Inst Phys, Taipei 11529, Taiwan.
    Uhl, S.
    Tech Univ Munich, Phys Dept, D-85748 Garching, Germany.
    Vasilishin, B. I.
    Tomsk Polytech Univ, Tomsk 634050, Russia.
    Vauth, A.
    CERN, CH-1211 Geneva 23, Switzerland.
    Veloso, J.
    Univ Aveiro, Dept Phys, P-3810193 Aveiro, Portugal.
    Vidon, A.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France.
    Virius, M.
    Czech Tech Univ, Prague 16636, Czech Republic.
    Wallner, S.
    Tech Univ Munich, Phys Dept, D-85748 Garching, Germany.
    Weisrock, T.
    Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany.
    Wilfert, M.
    Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany.
    Windmolders, R.
    Univ Bonn, Phys Inst, D-53115 Bonn, Germany.
    ter Wolbeek, J.
    Univ Freiburg, Phys Inst, D-79104 Freiburg, Germany.
    Zaremba, K.
    Warsaw Univ Technol, Inst Radioelect, PL-00665 Warsaw, Poland.
    Zavada, P.
    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia.
    Zavertyaev, M.
    Lebedev Phys Inst, Moscow 119991, Russia;Acad Sinica, Inst Phys, Taipei 11529, Taiwan.
    Zemlyanichkina, E.
    Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia.
    Ziembicki, M.
    Warsaw Univ Technol, Inst Radioelect, PL-00665 Warsaw, Poland.
    Longitudinal double-spin asymmetry A(1)(p) and spin-dependent structure function g(1)(p) of the proton at small values of x and Q(2)2018In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 781, p. 464-472Article in journal (Refereed)
    Abstract [en]

    We present a precise measurement of the proton longitudinal double-spin asymmetry A(1)(p) and the proton spin-dependent structure function g(1)(P) at photon virtualities 0.006 (GeV/c)(2) < Q(2) < 1 (GeV/c)(2) in the Bjorken x range of 4 x 10(-5) < x < 4 x 10(-2). The results are based on data collected by the COMPASS Collaboration at CERN using muon beam energies of 160 GeV and 200 GeV. The statistical precision is more than tenfold better than that of the previous measurement in this region. In the whole range of x, the measured values of A(1)(p) and g(1)(P) are found to be positive. It is for the first time that spin effects are found at such low values of x.

  • 3730. Agianian, Bogos
    et al.
    Lesch, Christine
    Loseva, Olga
    Dushay, Mitchell S.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Physiology and Developmental Biology, Comparative Physiology.
    Preliminary characterization of hemolymph coagulation in Anopheles gambiae larvae2007In: Developmental and Comparative Immunology, ISSN 0145-305X, E-ISSN 1879-0089, Vol. 31, no 9, p. 879-888Article in journal (Refereed)
    Abstract [en]

    Hemolymph coagulation is a first response to injury, impeding infection, and ending bleeding. Little is known about its molecular basis in insects, but clotting factors have been identified in the fruit fly Drosophila melanogaster. Here, we have begun to study coagulation in the aquatic larvae of the malaria vector mosquito Anopheles gambiae using methods developed for Drosophila. A delicate clot was seen by light microscopy, and pullout and proteomic analysis identified phenoloxidase and apolipophorin-I as major candidate clotting factors. Electron microscopic analysis confirmed clot formation and revealed it contains fine molecular sheets, most likely a result of lipophorin assembly. Phenoloxidase appears to be more critical in clot formation in Anopheles than in Drosophila. The Anopheles larval clot thus differs in formation, structure, and composition from the clot in Drosophila, confirming the need to study coagulation in different insect species to learn more about its evolution and adaptation to different lifestyles.

  • 3731.
    Agic, Heda
    et al.
    Department of Earth Science, University of California at Santa Barbara, Santa Barbara, USA.
    Högström, Anette
    Tromsø Universitetsmuseum.
    Jensen, Sören
    Área de Paleontología, Universidad de Extremadura, Avenida de Elvas s/n, Badajoz, Spain.
    Ebbestad, Jan Ove R.
    Uppsala University, Music and Museums, Museum of Evolution.
    Meinhold, Guido
    Geowissenschaftliches Zentrum der Universität Göttingen, Germany.
    Taylor, Wendy L.
    Department of Geological Sciences, University of Cape Town, Private Bag X3, Rondebosch 7701, South Africa.
    Palacios, Teodor
    Área de Paleontología, Universidad de Extremadura, Avenida de Elvas s/n, Badajoz, Spain.
    Høyberget, Magne
    Rennesveien 14, N-4513 Mandal, Norway.
    Life through the 'Varanger ice ages': microfossil record of late Neoproterozoic glacial-interglacial units from arctic Norway2018In: Geological Society of America Abstracts with Programs, Geological Society of America, 2018, Vol. 50Conference paper (Other academic)
    Abstract [en]

    The late Neoproterozoic strata in Finnmark (Arctic Norway) provide a good sedimentary record of Neoproterozoic glaciations on the Baltica paleocontinent. The lower Vestertana Group exposed on the Digermulen Peninsula contains two glaciogenic units, the Smalfjord and Mortensnes formations. Chemostratigraphic correlation dated the Smalfjord diamictite to the Marinoan glaciation (650-635 Ma), yet its age was also proposed to be older, per correlation to glacial units in central and southern Scandinavia. The diamictites are bracketing shales and siltstones of the interglacial Nyborg Formation. Stratigraphic, paleontological, and sedimentological data are presented from the interglacial-glacial succession, investigated by the Digermulen Early Life Research Group. Palynological analysis yielded well-preserved organic-walled microfossils (OWM) from the Nyborg Fm., and from fine-grained diamictite matrix in the Mortensnes Fm. via a modified extraction method.

    The interglacial Nyborg Fm. hosts a moderate diversity assemblage of prokaryotic and eukaryotic OWM, as well as acanthomorphic acritarchs such as Ceratosphaeridium, ?Cavaspina, and a novel process-bearing form. Organically preserved, enigmatic multicellular eukaryotic fossils occur in the upper Nyborg Fm. The Mortensens glacial assemblage is less diverse and contains bacterial filaments, leiosphaerids, toroidal forms, and Micrhystridium-type minute acanthomorphs.

    The presence of Doushantuo-Pertatataka type acritarchs in the Nyborg Fm., and small acanthomorphs in the Mortensnes diamictite corroborate an early Ediacaran age for the interglacial-glacial succession on Digermulen. In addition to the trace fossil and body-fossil record of Ediacara-biota in the overlying Stáhpogieddi Formation, the microfossil biostratigraphy suggests Marinoan and Gaskiers glaciation equivalent ages of the Varanger glaciations in Finnmark. Protistan diversity in the succession declined through and following the glaciation, until late Ediacaran.

  • 3732.
    Agic, Heda
    et al.
    Department of Earth Science, University of California at Santa Barbara, Santa Barbara, USA.
    Moczydłowska, Małgorzata
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology.
    Högström, Anette
    Tromsø Universitetsmuseum.
    Ebbestad, Jan Ove R.
    Uppsala University, Music and Museums, Museum of Evolution.
    Jensen, Sören
    Área de Paleontología, Universidad de Extremadura, Avenida de Elvas s/n, Badajoz, Spain.
    Meinhold, Guido
    Geowissenschaftliches Zentrum der Universität Göttingen, Germany.
    Palacios, Teodor
    Área de Paleontología, Universidad de Extremadura, Avenida de Elvas s/n, Badajoz, Spain.
    Taylor, Wendy L.
    Department of Geological Sciences, University of Cape Town, Private Bag X3, Rondebosch 7701, South Africa.
    Novis, Linn K.
    Tromsø Universitetsmuseum.
    Unusual organic-walled microfossil from the late Neoproterozoic Nyborg Formation, Digermulen Peninsula, Arctic Norway2017In: ISECT 2017, 2017Conference paper (Other academic)
    Abstract [en]

    The late Neoproterozoic Nyborg Formation is exposed in the Tanafjord area, Finnmark, Arctic Norway, on Digermulen and Varanger Peninsulas. The succession is composed of ~400 m of interbedded shales, siltstone and purple to grey sandstone, deposited between Neoproterozoic low latitude glacial deposits. The Nyborg Fm. lies on top of the Smalfjord diamictite, and is overlain by the Mortensnes diamictite (the latter was attributed to both Marinoan (650-635 Ma) and Gaskiers (579 Ma) glaciations) and the Ediacaran-Cambrian Stáhpogieddi Formation. Thus, the Nyborg Fm. represents late Neoproterozoic, probably the last Cryogenian interglacial interval. Presented material was collected in 2014 by members of Digermulen Early Life Research Group, from organic-rich, grey-green shales and siltstones of the Nyborg Mbr. D, uppermost Nyborg Fm. between Árasulluokta and Guvssájohka valleys. Organic-walled microfossils were extracted from shale via standard palynological acetolysis in hydrofluoric acid, and studied via light and scanning electron microscopy. Microfossils from the Nyborg Fm. include Synsphaeridium-type aggregated cells, unbranched bacterial filaments (Polythrichoides and Siphonophycus), sphaeromorph and envelope-bearing acritarchs (leiosphaerids, Stictosphaeridium, Simia), and previously unrecognized aggregated tubular microfossils. These taxa are long-ranging, but common in glacial-interglacial units worldwide, and thus broadly corroborate the Cryogenian age of the Nyborg sediments. The novel fossil, up to 300 μm in size, is a parenchymatous meshwork of interconnected organic-walled tubes that terminate in cup-shaped apices 4-11 µm in diameter. Irregular tube clusters are truncated both in macerates and in thin sections, suggesting post mortem transport. Elemental EDXS analysis indicates that extracted meshwork microfossils are predominantly composed of carbonaceous material and also associated with small amounts of titanium and vanadium. Considering the branching and adjoined body plan of carbonaceous fossil, it was likely multicellular and of eukaryotic affinity. As such, it may represent an important step in the evolution of complex multicellularity and morphological complexity several million years before the appearance of Ediacaran organisms.

  • 3733.
    Agirman, Natali
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Law, Department of Law.
    Egenhändiga sexualbrott i ljuset av NJA 2015 s. 5012017Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
  • 3734.
    Agius, Maria
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Law, Department of Law.
    Dying a Thousand Deaths: Recurring Emergencies and Exceptional Measures in International Law2010In: Goettingen Journal of International Law, ISSN 1868-1581, Vol. 2, no 1, p. 219-242Article in journal (Refereed)
    Abstract [en]

    Crises, while unforeseen and exceptional, appear with some regularity. Cri-sis management is not exceptional, but a recurring task. This paper studies the impact of international law on how international crises are handled and the room allowed for emergency measures within international legal dis-courses. It outlines the relationship between an extra-legal exceptionalist perspective, where law is considered an obstacle to emergency measures, and a more constitutionalist one, where exceptional measures are included within the legal paradigms. Examples are drawn from two contemporary crises: the global financial crisis, with particular reference to Iceland and the Icesave dispute, and the treatment of global epidemics and its effect on trade, with particular reference to the pandemic swine influenza A (H1N1). It is suggested that many factors seem to influence the choice of perspec-tive: inter alia previous deviations in similar situations and the institutional solidity of the legal environment of the rule in question. The role for inter-national law in crisis may increase through soft law guidance and persuasive advice from credible organisations that may assess the gravity of the situa-tion and suggest alternative courses of action within the ambit of law.

  • 3735.
    Agius, Maria
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Law, Department of Law.
    The Invocation of Necessity in International Law2009In: Netherlands International Law Review, ISSN 0165-070X, E-ISSN 1741-6191, Vol. 56, no 2, p. 95-135Article in journal (Refereed)
    Abstract [en]

    This article studies the effects of invoking international necessity, to see whether it can be reconciled with an aspiring international rule of law. Any field of application in theory possible, the doctrine is here applied to uses of force, illustrated by humanitarian interventions, actions against international terrorism and the 2004 Construction of a Wall case. Relationships between circumstances precluding wrongfulness and the grounds for treaty termination is examined in light of international practice, studying necessity's impact on the stability of treaty regimes. The author concludes that international tribunals when applying necessity generally heed the rule of law, the stability of treaties and the elevation of overriding norms. Necessity, if successfully invoked, is not perceived to alter substantive obligations. It cannot create a right to assume would-be illegal behaviour. As a result, necessity need not threaten international legal regime building, but may serve as a safety valve, allowing states to remain faithful to general norms, from which they are allowed to deviate only temporarily. In this manner, necessity can even contribute to the rule of law, thanks to its limited scope, constitutionalising emergency powers and subordinating them to pacta sunt servanda.

  • 3736.
    Agius, Maria
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Law, Department of Law.
    Åberopande av nödläge inom folkrätten2008In: Svensk Juristtidning, ISSN 0039-6591, p. 133-145Article in journal (Refereed)
    Abstract [sv]

    Den moderna folkrätten har ett utstuderat system för ansvarsutkrävande när en stat svikit de plikter man åtagit sig i förhållande till andra stater. Inom statsansvarsrätten finns dock ett antal ansvarsfrihetsgrunder. En av de mer kontroversiella är den s.k. nödlägesinvändningen. Nödläge har kommit upp i ett antal intressanta internationella rättsfall under de senaste decennierna, bl.a. rörande åtgärder för att skydda miljön, humanitära interventioner och internationell terroristbekämpning. Trots att det fortfarande är ett kontroversiellt institut är det tydligt att stater under vissa omständigheter undgår ansvar för folkrättsbrott om de handlat av nöd. Frågan som diskuteras här är huruvida möjligheten att avvika från internationella åtaganden med hänvisning till ett nödläge kan vara skadlig för den internationella rättens utveckling. Staters tillit till internationella rättsregimer kan skadas och deras benägenhet att reglera sina mellanhavanden i traktatsform minska. Nödlägesinstitutet är dock starkt kringskuret i internationell praxis. Vidare medför det inte att beteendet är att anse som i sig lagligt. Nödläge kan därför i vissa avseenden utan större fara för den internationella rättsordningen utgöra en nödvändig säkerhetsventil.

  • 3737.
    Agius, Maria F.
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Law, Department of Law.
    Strategies and Success in Litigation and Negotiation in the WTO2012In: International Negotiation, ISSN 1382-340X, E-ISSN 1571-8069, Vol. 17, no 1, p. 139-162Article in journal (Refereed)
    Abstract [en]

    This article analyzes linkages between litigation in the World Trade Organization (WTO) Dispute Settlement Body (DSB) and negotiation in multilateral trade rounds and develops a typology of links that can occur between the two processes. These include creating conditions where bargaining is informed by law, influencing the agenda-setting and creating momentum for negotiation on key issues, and affecting the status quo from which negotiations proceed by influencing nterpretation of trade rules in the DSB. The purpose is to test whether poor and inexperienced states that are disadvantaged in negotiations can improve their bargaining power in negotiation rounds by pursuing legal proceedings, to see whether links can be exploited for strategy-making to promote the interests of these states, and to discuss how the WTO as an international organization benefits from their empowerment. The strategies suggested in this article could improve the commitment and active participation of relatively non-influential member states. This could be conducive to perceptions of the WTO as a legitimate organization and to a more constructive climate for effective negotiations.

  • 3738.
    Agić, Heda
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology.
    A new species of small acritarch with porous wall structure from the early Cambrian of Estonia, and implications for the fossil record of eukaryotic picoplankton2015In: Palynology, ISSN 0191-6122, E-ISSN 1558-9188, Vol. 40, no 3, p. 343-356Article in journal (Refereed)
    Abstract [en]

    The Proterozoic-Phanerozoic transition records a general trend of decrease in phytoplankton cell size, in contrast tothe earlier and much larger Ediacaran acritarchs. Particularly minute, unornamented but sculptured organic-walledmicrofossils have been recovered from the lower Cambrian Lükati Formation in northern Estonia. The lack of anysignificant thermal alteration in the formation allowed for excellent preservation of fine microstructures on thesemicrofossils. Among the rich palynomorph assemblage in Lükati, a new species of tiny, spheroidal eukaryoticmicrofossil is recorded: Reticella corrugata gen. et sp. nov. It is characterised by a corrugated and flexible vesicle wallthat is densely perforated by nano-scale pores. Despite its unique morphology, the new species shares diagnosticcharacters with fossil and extant prasinophyte algae. R. corrugata is among the smallest microfossils with typicaleukaryotic morphology (conspicuous wall sculpture) and contributes to the diversity of the size class of smallacritarchs. Size, abundance, inferred prasinophyte affinity and eukaryotic wall sculpture make this new taxon alikely member of the early eukaryotic picoplankton.

  • 3739.
    Agić, Heda
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology.
    Fossil Focus: Acritarchs2016In: Palaeontology Online, Vol. 6, no 11, p. 1-13Article in journal (Other (popular science, discussion, etc.))
  • 3740.
    Agić, Heda
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology.
    Microfossils of eukaryotic cysts through time: A study of Precambrian-Ordovician organic-walled microbiota2014Licentiate thesis, comprehensive summary (Other academic)
  • 3741.
    Agić, Heda
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology.
    Palaeobiology and diversification of Proterozoic-Cambrian photosynthetic eukaryotes2015Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    One of the most important events in the history of life is the evolution of the complex, eukaryotic cell. The eukaryotes are complex organisms with membrane-bound intracellular structures, and they include a variety of both single-celled and multicellular organisms: plants, animals, fungi and various protists. The evolutionary origin of this group may be studied by direct evidence of past life: fossils. The oldest traces of eukaryotes have appeared by 2.4 billion years ago (Ga), and have additionally diversified in the period around 1.8 Ga. The Mesoproterozoic Era (1.6-1 Ga) is characterised by the first evidence of the appearance complex unicellular microfossils, as well as innovative morphologies, and the evolution of sexual reproduction and multicellularity. For a better understanding of the early eukaryotic evolution and diversification patterns, a part of this thesis has focused on the microfossil records from various time periods and geographic locations. Examination of microfossil morphology, cell wall microstructure and biochemical properties, reflect their intracellular complexity and function, and allow reconstructions of their life cycle, as well as observing the evolutionary pattern of change from Mesoproterozoic, to Cambrian-Ordovician transition. Several case studies included assemblages deriving from Mesoproterozoic, Neoproterozoic and early Paleozoic time intervals that show disparate morphotypes and innovative features indicative of algal clades. The Mesoproterozoic Ruyang Group in northern China has yielded a diverse microfossil assemblage that provides important clues about the diversification of different eukaryotic groups. Furthermore these microfossils contributed an additional evidence for the emergence of the crown group Eukarya by 1.7-1.4 Ga. In another part of this thesis, examination of wall microstructure and chemical properties via Raman spectroscopy has been used to assess the biological affinities of various Neoproterozoic problematic carbonaceous compression fossils. Studies on the early Phanerozoic (c. 545-485 Ma) assemblages from Estonia reconstructed patterns of the early radiations of phytoplankton and its evolutionary innovations. A continuing theme in this thesis has been using a combination of evidence of microfossils’ fine-scale morphology, ecology and chemical properties to determine their function in life, in addition to their systematic position.

    List of papers
    1. Affnity, life cycle, and intracellular complexity of organic-walled microfossils from the Mesoproterozoic of Shanxi, China
    Open this publication in new window or tab >>Affnity, life cycle, and intracellular complexity of organic-walled microfossils from the Mesoproterozoic of Shanxi, China
    2015 (English)In: Journal of Paleontology, ISSN 0022-3360, E-ISSN 1937-2337, Vol. 89, no 1, p. 28-50Article in journal (Refereed) Published
    Abstract [en]

    Light microscope and scanning electron microscope observations on new material of unicellularmicrofossils Dictyosphaera macroreticulata and Shuiyousphaeridium macroreticulatum, from the MesoproterozoicRuyang Group in China, provide insights into the microorganisms’ biological affinity, life cycle and cellularcomplexity. Gigantosphaeridium fibratum n. gen. et sp., is described and is one of the largest Mesoproterozoicmicrofossils recorded. Phenotypic characters of vesicle ornamentation and excystment structures, properties ofresistance and cell wall structure in Dictyosphaera and Shuiyousphaeridium are all diagnostic of microalgalcysts. The wide size ranges of the various morphotypes indicate growth phases compatible with the development ofreproductive cysts. Conspecific biologically, each morphotype represents an asexual (resting cyst) or sexual (zygotic cyst)stage in the life cycle, respectively. We reconstruct this hypothetical life cycle and infer that the organism demonstrates areproductive strategy of alternation of heteromorphic generations. Similarly in Gigantosphaeridium, a metabolicallyexpensive vesicle with processes suggests its protective role as a zygotic cyst. In combination with all these charactersand from the resemblance to extant green algae, we propose the placement of these ancient microorganisms in the stemgroup of Chloroplastida (Viridiplantae). A cell wall composed of primary and secondary layers in Dictyosphaera andShuiyouisphaeridium required a high cellular complexity for their synthesis and the presence of an endomembranesystem and the Golgi apparatus. The plastid was also present, accepting the organism was photosynthetic. The biotareveals a high degree of morphological and cell structural complexity, and provides an insight into ongoing eukaryoticevolution and the development of complex life cycles with sexual reproduction by 1200Ma.

    Place, publisher, year, edition, pages
    Cambridge Journals, 2015
    Keywords
    organic-walled microfossils; early eukaryotes; Mesoproterozoic; Dictyosphaera; Shuiyousphaeridium; algae; evolution; intracellular complexity
    National Category
    Geology
    Research subject
    Earth Science with specialization in Historical Geology and Palaeontology; Biology with specialization in Systematics
    Identifiers
    urn:nbn:se:uu:diva-247264 (URN)10.1017/jpa.2014.4 (DOI)000351478500003 ()
    Funder
    Swedish Research Council, 621-2009-4445
    Available from: 2015-03-16 Created: 2015-03-16 Last updated: 2017-12-04Bibliographically approved
    2. Diversity of organic-walled microfossils from the early Mesoproterozoic Ruyang Group, North China Craton - a window into the early eukaryote evolution
    Open this publication in new window or tab >>Diversity of organic-walled microfossils from the early Mesoproterozoic Ruyang Group, North China Craton - a window into the early eukaryote evolution
    2017 (English)In: Precambrian Research, ISSN 0301-9268, E-ISSN 1872-7433, p. 101-130Article in journal (Refereed) Published
    Abstract [en]

    Mesoproterozoic Era was an important time for the initial diversification of eukaryotic groups and the appearance of the first complex morphologies. While eukaryotes evolved around 2.4 Ga, the first microfossils with ornamentation and sculpture occur in the 1.8-1.6 Ga successions worldwide. Shales and siltstones of the Ruyang Group, Shanxi Province, North China Craton, record a high diversity of such organic-walled microfossils. Recently, the depositional ages of this succession has been constrained to 1.75-1.40 Ga via   zircon U-Pb dating. This dating extends back the time of the first appearance of complex eukaryotic characters (e.g. processes, complex wall structure) in the fossil record. We have conducted a biostratigraphic investigation on of the samples throughout the fossiliferous Ruyang Group to provide an estimate of the early eukaryotic diversity in the Mesoproterozoic. Light- and scanning electron microscope studies have documented 26 species, including several that are reported for the first time, and some that were previously known only from younger, Neoproterozoic strata. Fossil diversity is high in the upper Baicaoping Formation, declines in the middle and reaches its peak in the upper Beidajian Formation. Novel morphologies among the unicellular Ruyang biota include a variety of processes, from tube-like extensions to hirsute spines, vesicles with velutinous outer membranes, as well as numerous specimens with internal bodies of varying sizes. We have also recorded the globally distributed Mesoproterozoic taxa Dictyosphaera, Shuiyousphaeridium, and Tappania. Key characters displayed by the Ruyang biota are consistent with reproductive structures (especially cysts among modern protists. These microfossils provide an additional evidence for the emergence of the crown group Eukarya by 1.7-1.4 Ga.

    Keywords
    Mesoproterozoic, Ruyang Group, organic-walled microfossils, eukaryotic evolution, North China, Dictyosphaera.
    National Category
    Natural Sciences Geology
    Research subject
    Earth Science with specialization in Historical Geology and Palaeontology
    Identifiers
    urn:nbn:se:uu:diva-265216 (URN)10.1016/j.precamres.2017.04.042 (DOI)000404697200006 ()
    Projects
    Palaeobiology and diversification of Proterozoic-Cambrian photosynthetic eukaryotes
    Funder
    Swedish Research Council, 621-2009-4445
    Available from: 2015-10-25 Created: 2015-10-25 Last updated: 2018-02-22Bibliographically approved
    3. Raman spectroscopy and microstructural comparison of carbonaceous compression and body fossils from the Neoproterozoic of Siberian and Eastern European platforms
    Open this publication in new window or tab >>Raman spectroscopy and microstructural comparison of carbonaceous compression and body fossils from the Neoproterozoic of Siberian and Eastern European platforms
    (English)Manuscript (preprint) (Other academic)
    Abstract [en]

    Macroscopic, organic-walled fossils preserved as carbonaceous compressions and body fossils are commonly occurring in the Neoproterozoic-Cambrian successions worldwide. Most of these fossils, including studied here Chuaria, Tawuia, and Beltemelliformis, have been accepted as algae, and Sabellidites as an early metazoan. They possess limited characters for biological identification and differ in gross morphology of spherodial vs. tubular millimetre-sized specimens. Consequently, other methods than morphologic observations are needed to elucidate their affinities and, ultimately, phylogeny. Here we present a comparison of the Raman spectrographic signatures and new scanning electron microscope (SEM) observations on different carbonaceous compression and body fossils from the Khajpakh Formation (Siberian Platform), and Nekrasovo Formation (East European Platform), referred to the Tonian-Cryogenian transitional interval (c. 840-700 Ma) and the lowermost Cambrian stage, respectively. Data from the Raman spectroscopy of the walls of non-mineralised organisms reveal their chemical properties, and, in additions to microstructural characters, may be used to resolve the fossils’ phylogenetic affinities. To test the basic recognition of organic matter in studied photosynthetic organisms vs. animals, we have examined algal compression fossils and organically-preserved body-fossil. Differences in the Raman spectroscopic signature between various taxa have been observed. Vibrational absorption bands similar to those characteristic of α-chitin signature have been detected in the organic wall of Sabellidites, consistent with its metazoan identity. Distinct organic matter spectra of the macroalgae Chuaria, Tawuia and Beltanelliformis, and the possible early annelid Sabellidites indicate that Raman spectroscopy could be a useful method in identifying different branches of the early eukaryotes. Additionally, the recognition of the earliest metazoans among un-diagnostic tubular fossils by biochemical signatures and wall ultrastructure, could provide the minimum age of their origins.

    Keywords
    Neoproterozoic, Cambrian, tubular fossils, organic body fossils, Raman spectroscopy, SEM, East European Platform, Siberian Platform
    National Category
    Natural Sciences Geology
    Research subject
    Earth Science with specialization in Historical Geology and Palaeontology
    Identifiers
    urn:nbn:se:uu:diva-265206 (URN)
    Projects
    Palaeobiology and diversification of Proterozoic-Cambrian photosynthetic eukaryotes
    Funder
    Swedish Research Council, 621-2012-1669
    Available from: 2015-10-25 Created: 2015-10-25 Last updated: 2015-12-04
    4. Ecdysozoan-like sclerites among Ediacaran microfossils
    Open this publication in new window or tab >>Ecdysozoan-like sclerites among Ediacaran microfossils
    2015 (English)In: Geological Magazine, ISSN 0016-7568, E-ISSN 1469-5081, Vol. 152, no 6, p. 1145-1148Article in journal (Refereed) Published
    Abstract [en]

    We report the occurrence of organically preserved microfossils from the subsurface Ediacaran strata overlying the East European Platform in Poland, in the form of sclerites and cuticle fragments of larger organisms. They are morphologically similar to those known from Cambrian strata and associated with various metazoan fossils of recognized phyla. The Ediacaran age of the microfossils is evident from the stratigraphic position below the base of the Cambrian System and above the isotopically dated tuff layers at c. 551±4Ma. Within this strata interval, other characteristic Ediacaran microorganisms co-occur such as cyanobacteria, vendotaenids, microalgae, Ceratophyton,Valkyria and macroscopic annelidan Sabellidites. The recent contributions of organic sclerites in revealing the scope of the Cambrian explosion are therefore also potentially extendable back to the Ediacaran Period when animals first appear in the fossil record.

    Place, publisher, year, edition, pages
    Cambridge: Cambridge University Press, 2015
    Keywords
    Ediacaran metazoans; small carbonaceous fossils; Poland; organic preservation; refractory biopolymers
    National Category
    Geology
    Research subject
    Earth Science with specialization in Historical Geology and Palaeontology
    Identifiers
    urn:nbn:se:uu:diva-264156 (URN)10.1017/S001675681500045X (DOI)000367730400013 ()
    Funder
    Swedish Research Council, 621-2012-1669, 621-2011-4703
    Available from: 2015-10-06 Created: 2015-10-06 Last updated: 2017-12-01Bibliographically approved
    5. A new species of small acritarch with porous wall structure from the early Cambrian of Estonia, and implications for the fossil record of eukaryotic picoplankton
    Open this publication in new window or tab >>A new species of small acritarch with porous wall structure from the early Cambrian of Estonia, and implications for the fossil record of eukaryotic picoplankton
    2015 (English)In: Palynology, ISSN 0191-6122, E-ISSN 1558-9188, Vol. 40, no 3, p. 343-356Article in journal (Refereed) Published
    Abstract [en]

    The Proterozoic-Phanerozoic transition records a general trend of decrease in phytoplankton cell size, in contrast tothe earlier and much larger Ediacaran acritarchs. Particularly minute, unornamented but sculptured organic-walledmicrofossils have been recovered from the lower Cambrian Lükati Formation in northern Estonia. The lack of anysignificant thermal alteration in the formation allowed for excellent preservation of fine microstructures on thesemicrofossils. Among the rich palynomorph assemblage in Lükati, a new species of tiny, spheroidal eukaryoticmicrofossil is recorded: Reticella corrugata gen. et sp. nov. It is characterised by a corrugated and flexible vesicle wallthat is densely perforated by nano-scale pores. Despite its unique morphology, the new species shares diagnosticcharacters with fossil and extant prasinophyte algae. R. corrugata is among the smallest microfossils with typicaleukaryotic morphology (conspicuous wall sculpture) and contributes to the diversity of the size class of smallacritarchs. Size, abundance, inferred prasinophyte affinity and eukaryotic wall sculpture make this new taxon alikely member of the early eukaryotic picoplankton.

    Keywords
    Cambrian, Estonia, organic-walled microfossils, picoplankton, prasinophytes, small acritarchs
    National Category
    Geology Ecology
    Research subject
    Earth Science with specialization in Historical Geology and Palaeontology
    Identifiers
    urn:nbn:se:uu:diva-265208 (URN)10.1080/01916122.2015.1068879 (DOI)000386047200007 ()
    Projects
    Palaeobiology and diversification of Proterozoic-Cambrian photosynthetic eukaryotes
    Funder
    Swedish Research Council, 621-2012-1669
    Available from: 2015-10-25 Created: 2015-10-25 Last updated: 2017-11-10Bibliographically approved
    6. Reproductive cyst and operculum formation in the Cambrian-Ordovician galeate-plexus microfossils
    Open this publication in new window or tab >>Reproductive cyst and operculum formation in the Cambrian-Ordovician galeate-plexus microfossils
    2016 (English)In: GFF, ISSN 1103-5897, E-ISSN 2000-0863, Vol. 138, no 2, p. 278-294Article in journal (Refereed) Published
    Abstract [en]

    Unicellular organic-walled microfossils from the Cambrian-Ordovician transition in Estonia (ca. 490-480 million years ago) exhibit rare characters reflecting their function as reproductive algal cysts. The studied assemblages record the evolutionary history of phytoplankton in the early Paleozoic Era: novel morphologies appearing through the Cambrian and subsequently diversifying in the Ordovician. Well preserved specimens were extracted following a standard palynological method and studied by light transmitted microscopy. The galeate plexus acritarchs Caldariola, Priscogalea and Stelliferidium have revealed exceptionally preserved morphological elements and a rare structure among both fossil and extant protists – an opening with operculum (lid) in reproductive cysts, in addition to lavish vesicle ornamentation and sculpture. Analogous morphology is observed in the living dasycladalean alga Acetabularia (Chlorophyta), which possesses an intrinsic lid-forming apparatus used during organism’s reproductive stage. Based on the observations on the fossil material and studies on the Acetabularia lid-formation, we propose a model of operculum formation in the galeate plexus microorganisms. Due to strong morphological and ecological similarities between galeate fossils and dasycladalean cysts, and the antiquity of this algal order, galeates may be positioned within green algae, more specifically Dasycladales. Unique morphology of the operculum-bearing microbiota would have required a high degree of intracellular complexity for its development, suggesting that advanced intracellular machinery was present already in the early Paleozoic phytoplankton. Additionally, minute prasinophyte microfossils Reticella corrugata  are reported for the first time in the Upper Cambrian strata. 

    Keywords
    acritarchs, Baltica, cyst-formation, Dasycladales, Estonia, galeate plexus, microfossils, operculum, Ordovician, palaeobiology
    National Category
    Geology Botany
    Research subject
    Earth Science with specialization in Historical Geology and Palaeontology
    Identifiers
    urn:nbn:se:uu:diva-265207 (URN)10.1080/11035897.2015.1116603 (DOI)000379763500001 ()
    Projects
    Palaeobiology and diversification of Proterozoic-Cambrian photosynthetic eukaryotes
    Funder
    Swedish Research Council, 621-2012-1669Danish National Research Foundation, DNRF53
    Available from: 2015-10-25 Created: 2015-10-25 Last updated: 2017-12-01Bibliographically approved
  • 3742.
    Agić, Heda
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology.
    Moczydłowska, Małgorzata
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology.
    Is cyst formation in early eukaryotes a requirement for their preservation in the fossil record?2015In: Abstracts of the Astrobiology Science Conference 2015: Habitability, Habitable Worlds and Life: EARTH’S EARLY BIOSPHERE: LIFE ON AN “ALIEN” PLANET, 2015Conference paper (Refereed)
    Abstract [en]

    Most of the Archaean-Proterozoic fossil record consists of non-biomineralizing microorganisms or their signatures. Body fossils of bacteria and early eukaryotes are preserved in siliciclastics, shales and carbonates, and are usually studied by preparation of thin sections or extraction from the rock matrix via acid maceration.The first eukaryotic organic-walled microfossils (OWM) appear at least by 1.8 Ga and undergo morphological diversification and evolutionary radiation in the Mesoproterozoic. There are no preserved eukaryotic-grade microfossils except OWM until the onset of biomineralization much later in the Neoproterozoic, evident in the record of testate amoebae (VSM) and microfossils with scaly elements.OWM are a less conspicuous component of the fos-sil record than taxa with skeletal or shelly elements. Organic matter decays quickly upon death of the organism, due to autolytic enzymes or degradation via het-erotrophy. However, species producing vegetative cells, resting cysts, zygotes, or spores, show considerable resistance to autolysis. Case studies on extractable carbonaceous OWM indicate they are preserved due to complex refractory molecules in the structure of their sturdy vesicle walls. Living analogues across protistan clades utilise such sporopollenin-like compounds for the cyst wall construction during reproductive phase. Algaenan-containing trilaminar sheath structure (TLS) is secreted during aplanospore formation in extant chlorophyte alga Haematococcus. TLS has also been documented in Leiosphaeridia acritarchs from the Cambrian Lükati Formation in Estonia. Leiosphaeridia is a long ranging morphotype, dating as far back as 1.8 Ga. Presence of TLS in these fossils suggests their function as reproductive cyst. Dictyosphaera-Shuiyousphaeridium plexus from the Mesoproterozoic Ruyang Group, China, also exhibits cyst-like morphology and unique elements of wall reinforcement: internally secreted organic platelets.In addition to these early OWM, many Meso-Neoproterozoic taxa such as Tappania, Trachyhystrychosphaera and Kildinella contain cyst-like characters: 1) reproductive openings, 2) ornamentation, 3) occa-sionally preserved internal bodies and 4) acetolysis-resistant vesicle walls – properties observed among extant encysting protists.Ornamented (process-bearing) microfossils in par-ticular bear strong similarities with zygotes of living unicellular algae. Property of acetolysis-resistant vesicle is a result of sporopollenin-like macromolecules in the wall, synthesized most commonly by the autotrophic eukaryotes. Presence of such recalcitrant organic walls requires significant metabolic investment by the microorganism, which suggests a protective and/or reproductive function. This also allows for easier, and more detailed preservation in the rock record.One of the concerns arising from the studies on the early eukaryotic fossils is the bias towards encysting organisms. The eventual search for the fossil record on other planetary bodies could face the same challenges as the Precambrian palaeobiology: fossilisation and eventual detection might be problematic for any unicellular eukaryotic-grade organisms if they have not evolved reproduction via encystment, or cyst formation as means of coping with adverse environmental conditions.

  • 3743.
    Agić, Heda
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology.
    Moczydłowska, Małgorzata
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology.
    Raman spectra analysis and comparison of Neoproterozoic organic-walled mesofossils2012In: The 2012 Fermor Meeting of the Geological Society: The Neoproterozoic Era: Evolution, Glaciation, Oxygenation / [ed] Fairchild I., Condon D., Lenton T., Shields-Zhou G., Brasier M.D., London, 2012, Vol. 1, p. 86-Conference paper (Refereed)
    Abstract [en]

    Skeletal material first appears in the rock record in the terminal Ediacaran, leaving most of the Earth’s history only to minute organic fossils. Aside from abundant acritarchs (unicellular organic-walled phytoplankton) present from at least ~2.5 Ga, other Proterozoic organic fossils of complex (eukaryotic) organisms include fungi and macroscopic algae of still debated taxonomy. Often preserved as flattened carbonaceous filaments in several morphologies: (1) rounded, (2) stick-like elongate and (3) branching, these Neoproterozoic fossils, including Chuaria, Morania, Beltanelloides, Vendotaenia, possess limited characters and differ little in gross morphology. As a result, other methods are needed to elucidate their biological affinities and, ultimately, phylogeny.

    Here we present the comparison of the Raman spectra analysis of different macroalgal genera from Yakutia, Siberia, as well as that of a putative polychaete Sabellidites from the East European Platform, dated to the early Cryogenian (840-700 Ma) and lowermost Cambrian respectively.

    Data from the vibrational modes of organic molecules from the wall of unmineralised organisms reveal their chemistry and partially wall ultrastructure, presumably an indication of their relationships. Polyaromatic chain hydrocarbons and n-aliphatic pyrolysates suggest algal affinity for some of the Neoproterozoic organic problematica, yet most of the Raman spectra results are still difficult to fully identify, partially owing to the thermal maturity of the host rocks. However, there are clear differences between various groups, differentiating between parts of a single plexus (cf previous studies of Chuaria-Tawuia suggesting them to be components of a multicellular plant) and elements from other taxa. Additionally, the distinct organic matter spectra of Chuaria and Sabellidites indicate that Raman spectroscopy could be a useful method in identifying different branches of the early eukaryotes.

    As they are usually shallow-water and dependant on sunlight, the record of sturdy photosynthetic macroorganisms in the  Neoproterozoic strengthens the evidence that limits the extent of the harsh environmental conditions during the Cryogenian period, at least during the Kaigas and Sturtian glaciations.

  • 3744.
    Agić, Heda
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology.
    Moczydłowska, Małgorzata
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology.
    Raman spectroscopy and microstructural comparison of carbonaceous compression and body fossils from the Neoproterozoic of Siberian and Eastern European platformsManuscript (preprint) (Other academic)
    Abstract [en]

    Macroscopic, organic-walled fossils preserved as carbonaceous compressions and body fossils are commonly occurring in the Neoproterozoic-Cambrian successions worldwide. Most of these fossils, including studied here Chuaria, Tawuia, and Beltemelliformis, have been accepted as algae, and Sabellidites as an early metazoan. They possess limited characters for biological identification and differ in gross morphology of spherodial vs. tubular millimetre-sized specimens. Consequently, other methods than morphologic observations are needed to elucidate their affinities and, ultimately, phylogeny. Here we present a comparison of the Raman spectrographic signatures and new scanning electron microscope (SEM) observations on different carbonaceous compression and body fossils from the Khajpakh Formation (Siberian Platform), and Nekrasovo Formation (East European Platform), referred to the Tonian-Cryogenian transitional interval (c. 840-700 Ma) and the lowermost Cambrian stage, respectively. Data from the Raman spectroscopy of the walls of non-mineralised organisms reveal their chemical properties, and, in additions to microstructural characters, may be used to resolve the fossils’ phylogenetic affinities. To test the basic recognition of organic matter in studied photosynthetic organisms vs. animals, we have examined algal compression fossils and organically-preserved body-fossil. Differences in the Raman spectroscopic signature between various taxa have been observed. Vibrational absorption bands similar to those characteristic of α-chitin signature have been detected in the organic wall of Sabellidites, consistent with its metazoan identity. Distinct organic matter spectra of the macroalgae Chuaria, Tawuia and Beltanelliformis, and the possible early annelid Sabellidites indicate that Raman spectroscopy could be a useful method in identifying different branches of the early eukaryotes. Additionally, the recognition of the earliest metazoans among un-diagnostic tubular fossils by biochemical signatures and wall ultrastructure, could provide the minimum age of their origins.

  • 3745.
    Agić, Heda
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology.
    Moczydłowska, Małgorzata
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology.
    Canfield, Donald
    University of Southern Denmark.
    Cyst and operculum formation in Cambrian-Ordovician galeate acritarchs from Estonia: implications for the algal phylogeny and blooms in the early Paleozoic2014In: 4th International Palaeontological Congress Abstract Volume: The history of life: a view from the Southern Hemisphere, 2014, p. 913-Conference paper (Other academic)
    Abstract [en]

    Unicellular organic-walled microfossils have been recovered from the Cambrian Lükati Formation and the Tremadocian Varangu Formation exposed in northern Estonia. Due to a combination of main morphological and biochemical characters, mainly a) excystment opening, b) processes, c) acetolysis-  resistant vesicle wall, microfossils have been interpreted as reproductive cysts of green algae. Both microfossil assemblages reflect the evolutionary patterns though the early Palaeozoic: from the Cambrian radiation of morphologically innovative taxa to increase in diversity and more disparate Ordovician forms. Combined light transmitted and scanning electron microscopy on the Middle Cambrian to Tremadocian galeate plexus acritarchs CaldariolaPriscogalea and Stelliferidium, revealed exceptionally preserved morphological elements and rare structure among fossil and extant microbiota – an opening with operculum (lid) in reproductive cyst, in addition to lavish vesicle ornamentation and sculpture. Operculum formation model is reconstructed from fossils at different stages of operculum position and attachment. Comparative morphology shows strong similarity of galeates to the reproductive cysts of the extant algae of Dasycladales (Chlorophyta), where the lid covering the cyst opening is determined by an intrinsic lid-forming apparatus during the organism’s reproductive stage. Opercula in Cambro-Ordovician galeate acritarchs and Dasycladales may be considered a homologous character. Unique morphology of the operculum-bearing microbiota would have required a degree of intracellular sophistication for its development, suggesting advanced intracellular machinery present already in the early Palaeozoic phytoplankton. Additionally, a new species of minute, sphaeromorphic and aggregated eukaryotic microfossils is recorded. It possesses a vesicle wall with corrugated sculpture and perforated by nano-scale pores. These minute early Cambrian microfossils have diagnostic characters of prasinophyte algae.

  • 3746.
    Agić, Heda
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology.
    Moczydłowska, Małgorzata
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology.
    Canfield, Donald
    University of Southern Denmark .
    Reproductive cyst and operculum formation in the Cambrian-Ordovician galeate-plexus microfossils2016In: GFF, ISSN 1103-5897, E-ISSN 2000-0863, Vol. 138, no 2, p. 278-294Article in journal (Refereed)
    Abstract [en]

    Unicellular organic-walled microfossils from the Cambrian-Ordovician transition in Estonia (ca. 490-480 million years ago) exhibit rare characters reflecting their function as reproductive algal cysts. The studied assemblages record the evolutionary history of phytoplankton in the early Paleozoic Era: novel morphologies appearing through the Cambrian and subsequently diversifying in the Ordovician. Well preserved specimens were extracted following a standard palynological method and studied by light transmitted microscopy. The galeate plexus acritarchs Caldariola, Priscogalea and Stelliferidium have revealed exceptionally preserved morphological elements and a rare structure among both fossil and extant protists – an opening with operculum (lid) in reproductive cysts, in addition to lavish vesicle ornamentation and sculpture. Analogous morphology is observed in the living dasycladalean alga Acetabularia (Chlorophyta), which possesses an intrinsic lid-forming apparatus used during organism’s reproductive stage. Based on the observations on the fossil material and studies on the Acetabularia lid-formation, we propose a model of operculum formation in the galeate plexus microorganisms. Due to strong morphological and ecological similarities between galeate fossils and dasycladalean cysts, and the antiquity of this algal order, galeates may be positioned within green algae, more specifically Dasycladales. Unique morphology of the operculum-bearing microbiota would have required a high degree of intracellular complexity for its development, suggesting that advanced intracellular machinery was present already in the early Paleozoic phytoplankton. Additionally, minute prasinophyte microfossils Reticella corrugata  are reported for the first time in the Upper Cambrian strata. 

  • 3747.
    Agić, Heda
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology.
    Moczydłowska, Małgorzata
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology.
    Yin, Leiming
    Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences.
    Affnity, life cycle, and intracellular complexity of organic-walled microfossils from the Mesoproterozoic of Shanxi, China2015In: Journal of Paleontology, ISSN 0022-3360, E-ISSN 1937-2337, Vol. 89, no 1, p. 28-50Article in journal (Refereed)
    Abstract [en]

    Light microscope and scanning electron microscope observations on new material of unicellularmicrofossils Dictyosphaera macroreticulata and Shuiyousphaeridium macroreticulatum, from the MesoproterozoicRuyang Group in China, provide insights into the microorganisms’ biological affinity, life cycle and cellularcomplexity. Gigantosphaeridium fibratum n. gen. et sp., is described and is one of the largest Mesoproterozoicmicrofossils recorded. Phenotypic characters of vesicle ornamentation and excystment structures, properties ofresistance and cell wall structure in Dictyosphaera and Shuiyousphaeridium are all diagnostic of microalgalcysts. The wide size ranges of the various morphotypes indicate growth phases compatible with the development ofreproductive cysts. Conspecific biologically, each morphotype represents an asexual (resting cyst) or sexual (zygotic cyst)stage in the life cycle, respectively. We reconstruct this hypothetical life cycle and infer that the organism demonstrates areproductive strategy of alternation of heteromorphic generations. Similarly in Gigantosphaeridium, a metabolicallyexpensive vesicle with processes suggests its protective role as a zygotic cyst. In combination with all these charactersand from the resemblance to extant green algae, we propose the placement of these ancient microorganisms in the stemgroup of Chloroplastida (Viridiplantae). A cell wall composed of primary and secondary layers in Dictyosphaera andShuiyouisphaeridium required a high cellular complexity for their synthesis and the presence of an endomembranesystem and the Golgi apparatus. The plastid was also present, accepting the organism was photosynthetic. The biotareveals a high degree of morphological and cell structural complexity, and provides an insight into ongoing eukaryoticevolution and the development of complex life cycles with sexual reproduction by 1200Ma.

  • 3748.
    Agić, Heda
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology.
    Moczydłowska, Małgorzata
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology.
    Yin, Leiming
    Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences.
    Diversity of organic-walled microfossils from the early Mesoproterozoic Ruyang Group, North China Craton - a window into the early eukaryote evolution2017In: Precambrian Research, ISSN 0301-9268, E-ISSN 1872-7433, p. 101-130Article in journal (Refereed)
    Abstract [en]

    Mesoproterozoic Era was an important time for the initial diversification of eukaryotic groups and the appearance of the first complex morphologies. While eukaryotes evolved around 2.4 Ga, the first microfossils with ornamentation and sculpture occur in the 1.8-1.6 Ga successions worldwide. Shales and siltstones of the Ruyang Group, Shanxi Province, North China Craton, record a high diversity of such organic-walled microfossils. Recently, the depositional ages of this succession has been constrained to 1.75-1.40 Ga via   zircon U-Pb dating. This dating extends back the time of the first appearance of complex eukaryotic characters (e.g. processes, complex wall structure) in the fossil record. We have conducted a biostratigraphic investigation on of the samples throughout the fossiliferous Ruyang Group to provide an estimate of the early eukaryotic diversity in the Mesoproterozoic. Light- and scanning electron microscope studies have documented 26 species, including several that are reported for the first time, and some that were previously known only from younger, Neoproterozoic strata. Fossil diversity is high in the upper Baicaoping Formation, declines in the middle and reaches its peak in the upper Beidajian Formation. Novel morphologies among the unicellular Ruyang biota include a variety of processes, from tube-like extensions to hirsute spines, vesicles with velutinous outer membranes, as well as numerous specimens with internal bodies of varying sizes. We have also recorded the globally distributed Mesoproterozoic taxa Dictyosphaera, Shuiyousphaeridium, and Tappania. Key characters displayed by the Ruyang biota are consistent with reproductive structures (especially cysts among modern protists. These microfossils provide an additional evidence for the emergence of the crown group Eukarya by 1.7-1.4 Ga.

  • 3749.
    Agić, Heda
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology.
    Moczydłowska, Małgorzata
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology.
    Yin, Leiming
    Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences.
    Morphology of the Proterozoic eukaryotic microfossils as a reflection of their intracellular complexity2014In: 4th International Palaeontological Congress Abstract Volume: The history of life: a view fom the southern hemisphere / [ed] Esperanza CERDEÑO, 2014, p. 256-Conference paper (Refereed)
    Abstract [en]

    Mesoproterozoic is a time of increasing diversity of microscopic life and appearance of intricate new cell morphologies. First eukaryotes may have evolved around 2.4 Ga, but the first microbiota with intricate sculpture and ornamentation are found in the younger, 1.8.-1.6 Ga successions worldwide. Such microfossils were uncovered from the Ruyang Formation in Shanxi, China and Roper Group, Northern Territories, Australia, dating back to 1.6-1.0 Ga ago. Some of these unicellular organic-walled fossils share characters with Ediacaran and Phanerozoic fossils, as well as extant green microalgae. Key characters among some Precambrian acritarchs are acetolysis-resistant vesicle with multi-layered walls; vesicle ornamentation by diverse processes that are produced during cyst formation; and excystment openings for the release of gametes or daughter-cells. Combination of these morphological elements, also present in extant phytoplankton, reflects the fossils’ protective function as reproductive cysts, indicating that complex life cycles and reproduction were well under way in Mesoproterozoic. Several case studies of microfossil morphology likely induced by intrinsic eukaryotic mechanisms are presented.

    Distinctive vesicle wall composed of the primary layer reinforced by polygonal platelets in Mesoproterozoic taxa Dictyosphaera and Shuiyouisphaeridium, as well as the sophisticated vesicle-wall patterning on the fossil sphaeromorphs Valeria and younger Cerebrosphaera would have required a certain degree of complexity for their formation, as observed in the present day analogues among eukaryotic protists. This suggests the activity of the key eukaryotic organelles and cellular mechanisms and signalling for the cyst formation. Considering that Golgi apparatus and the endoplasmatic reticulum are the organelles regulating eukaryotic secretory pathway and synthesis of biopolymers used in cell-wall construction, they would have been required for the complex morphology observed in these Precambrian taxa. Therefore, the presence of GA and ER in the eukaryotic cell is inferred at the minimum age of 1.6-1.4 Ga. Similarly, morphology of acritarchs of the Cambrian galeate plexus, namely openings with opercula, is likely induced by the activity of the LFA organelle (lid-forming apparatus) as in the extant dasycladalean alga Acetabularia.

    Additionally, several new morphotypes from the Ruyang Formation are presented. These unicellular fossils bear a velutinous outer membrane surrounding an internal sphere, which suggests a protective function of a reproductive or a resting cyst.

    Cyst-like morphology varies in disparity, but its key features are consistent through Mesoproterozoic, Neoproterozoic and early Palaeozoic.

  • 3750.
    Agić, Heda
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology.
    Ward, L.
    Juarez Rivera, M.
    Kerrigan, Z.
    Petryshyn, V.A.
    Corsetti, F.A.
    Tripati, A.
    Lateral growth of Late Pleistocene stromatolites from Walker Lake (Nevada) and proxy constraints on environmental change2014In: 2014 GSA Annual Meeting in Vancouver, 2014Conference paper (Refereed)
    Abstract [en]

    Walker Lake, a terminal sodium bicarbonate lake in Western Nevada (Great Basin, USA) contains numerous carbonate structures, including stromatolites. The lake is a remnant of the larger Pleistocene Lake Lahontan system that has been isolated for the last ~12 ka. Stromatolites of unique macroscale morphology were collected at the ancient Lahontan shoreline during the 2014 International Geobiology Course.

    Initial observations of a stromatolite bed revealed a bowl-shaped carbonate framework composed of stacked, weakly laminated, vertical and horizontal petal-like structures with copious pore space. One laterally-oriented petal was taken off of the main structure and studied. Petrographical observations exhibit two types of alternating microfabrics and three transitions in microfabric. Both sparry crystal fans of calcite, and convex layers of fine micrite with occasional trapped crystals and fossils, were observed.

    Calibrated 14C ages (IntCal13) for the proximal and the distal end of the stromatolite are 35,540 YBP and 33,580 YBP, respectively. Clumped isotope (D47)-based estimates of temperature steadily increase throughout most of this interval, from the beginning of accretion, to the middle of the structure. By the distal end, values are at their peak, and at the tip temperatures decrease again. D47-temperatures correspond to microfabric, with textural changes associated with evidence for climatic fluctuations.

    We suggest the stromatolite formation may have been initiated during warmer intervals, induced by the chemical precipitation of calcite fans which served as a substrate for a biofilm growth. Microbial activity trapped the fine sediment and formed micrite. Colder conditions propagated fan precipitation. Microfabric alternation throughout the stromatolite records environmental change in the span of ca. 2000 years of Lake Lahontan history, likely in response to lake level fluctuations.

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