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Zlomanczuk, Jozef
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Adlarson, P., Augustyniak, W., Bardan, W., Bashkanov, M., Bass, S. D., Berlowski, M., . . . Zurek, M. (2020). Search for η mesic 3He with the WASA-at-COSY facility in the pd -> 3He2γ and pd -> 3He6γ  reaction. Physics Letters B, 802, Article ID 135205.
Öppna denna publikation i ny flik eller fönster >>Search for η mesic 3He with the WASA-at-COSY facility in the pd -> 3He2γ and pd -> 3He6γ  reaction
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2020 (Engelska)Ingår i: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 802, artikel-id 135205Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

We report on the experimental search for the bound state of an eta meson and He-3 nucleus performed using the WASA-at-COSY detector setup. In order to search for the eta-mesic nucleus decay, the pd -> (3)He2(gamma) and pd -> (3)He6 gamma channels have been analysed. These reactions manifest the direct decay of the ti meson bound in a He-3 nucleus. This non-mesonic decay channel has been considered for the first time. When taking into account only statistical errors, the obtained excitation functions reveal a slight indication for a possible bound state signal corresponding to a He-3-eta nucleus width Gamma above 20 MeV and binding energy B-s between 0 and 15 MeV. However, the determined cross sections are consistent with zero in the range of the systematic uncertainty. Therefore, as final result we estimate only the upper limit for the cross section of the eta-mesic He-3 nucleus formation followed by the eta meson decay which varies between 2 nb and 15 nb depending on possible bound state parameters.

Nyckelord
eta-mesic nuclei, eta-meson
Nationell ämneskategori
Subatomär fysik
Identifikatorer
urn:nbn:se:uu:diva-409716 (URN)10.1016/j.physletb.2020.135205 (DOI)000515091400060 ()
Tillgänglig från: 2020-04-27 Skapad: 2020-04-27 Senast uppdaterad: 2020-04-27Bibliografiskt granskad
Adlarson, P., Augustyniak, W., Bardan, W., Bashkanov, M., Bergmann, F. S., Berlowski, M., . . . Witala, H. (2020). Three-nucleon dynamics in dp breakup collisions using the WASA detector at COSY-Julich. Physical Review C: Covering Nuclear Physics, 101(4), Article ID 044001.
Öppna denna publikation i ny flik eller fönster >>Three-nucleon dynamics in dp breakup collisions using the WASA detector at COSY-Julich
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2020 (Engelska)Ingår i: Physical Review C: Covering Nuclear Physics, ISSN 2469-9985, E-ISSN 2469-9993, Vol. 101, nr 4, artikel-id 044001Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The differential cross section for the H-1(d, pp)n breakup reaction at deuteron beam energy of 340 MeV has been measured with the use of the WASA detector at COSY-Jillich. The set of proton-proton coincidences registered at the Forward Detector has been analyzed on a dense grid of kinematic variables, giving in total around 5600 data points. The cross-section data are compared to theoretical predictions based on the state-ofthe-art nucleon-nucleon potentials, combined with a three-nucleon force or the Coulomb interaction or carried out in a relativistic regime.

Nationell ämneskategori
Subatomär fysik
Identifikatorer
urn:nbn:se:uu:diva-410078 (URN)10.1103/PhysRevC.101.044001 (DOI)000525327500001 ()
Tillgänglig från: 2020-05-26 Skapad: 2020-05-26 Senast uppdaterad: 2020-05-26Bibliografiskt granskad
Adlarson, P., Augustyniak, W., Bardan, W., Bashkanov, M., Bergmann, F. S., Berlowski, M., . . . Zurek, M. (2019). Examination of the production of an isotensor dibaryon in the pp -> pp pi(+)pi(-) reaction. Physical Review C: Covering Nuclear Physics, 99(2), Article ID 025201.
Öppna denna publikation i ny flik eller fönster >>Examination of the production of an isotensor dibaryon in the pp -> pp pi(+)pi(-) reaction
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2019 (Engelska)Ingår i: Physical Review C: Covering Nuclear Physics, ISSN 2469-9985, E-ISSN 2469-9993, Vol. 99, nr 2, artikel-id 025201Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The quasifree pp -> pp pi(+)pi(-) reaction has been measured by means of pd collisions at T-p = 1.2 GeV using the WASA detector setup at COSY enabling exclusive and kinematically complete measurements. Total and differential cross sections have been extracted for the energy region T-p = 1.08-1.36 GeV (root s = 2.35-2.46 GeV) covering thus the regions of N* (1440 ) and Delta(1232)Delta(1232) resonance excitations. Calculations describing these excitations by t-channel meson exchange as well as isospin relations based on the pp -> pp pi(0)pi(0) data underpredict substantially the measured total cross section. The calculations are also at variance with specific experimental differential cross sections. An isotensor Delta N dibaryon resonance with I(J(P)) = 2(1(+) ) produced associatedly with a pion is able to overcome these deficiencies. Such a dibaryon was predicted by Dyson and Xuong [Phys. Rev. Lett. 13, 815 (1964)] and more recently calculated by A. Gal and H. Garcilazo [Nucl. Phys. A 928, 73 (2014)].

Ort, förlag, år, upplaga, sidor
AMER PHYSICAL SOC, 2019
Nationell ämneskategori
Subatomär fysik
Identifikatorer
urn:nbn:se:uu:diva-377601 (URN)10.1103/PhysRevC.99.025201 (DOI)000457696100003 ()
Tillgänglig från: 2019-02-26 Skapad: 2019-02-26 Senast uppdaterad: 2019-03-07Bibliografiskt granskad
Adlarson, P., Augustyniak, W., Bardan, W., Bashkanov, M., Bergmann, F. S., Berlowski, M., . . . Wilkin, C. (2018). Backward single-pion production in the pd -> He-3 pi(0)reaction with WASA-at-COSY. European Physical Journal A, 54(9), Article ID 149.
Öppna denna publikation i ny flik eller fönster >>Backward single-pion production in the pd -> He-3 pi(0)reaction with WASA-at-COSY
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2018 (Engelska)Ingår i: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 54, nr 9, artikel-id 149Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

New data on the production of single neutral pions in the pd -> He-3 pi(0) reaction are presented. For fifteen proton beam momenta between p(p) = 1.60GeV/c and p(p) = 1.74 GeV/c, differential cross sections are determined over a large fraction of the backward hemisphere. Since the only previous systematic measurements of single-pion production at these energies were made in collinear kinematics, the present work constitutes a significant extension of the current knowledge on this reaction. Even this far above the production threshold, significant changes are found in the behaviour of the angular distributions over small intervals in beam momentum.

Ort, förlag, år, upplaga, sidor
SPRINGER, 2018
Nationell ämneskategori
Astronomi, astrofysik och kosmologi Subatomär fysik
Identifikatorer
urn:nbn:se:uu:diva-366738 (URN)10.1140/epja/i2018-12585-3 (DOI)000444638600001 ()
Forskningsfinansiär
EU, FP7, Sjunde ramprogrammet, 283286
Tillgänglig från: 2018-12-10 Skapad: 2018-12-10 Senast uppdaterad: 2018-12-10Bibliografiskt granskad
Adlarson, P., Augustyniak, W., Bardan, W., Bashkanov, M., Bergmann, F. S., Berlowski, M., . . . Zurek, M. (2018). Importance of d-wave contributions in the charge symmetry breaking reaction dd -> He-4 pi(0). Physics Letters B, 781, 645-650
Öppna denna publikation i ny flik eller fönster >>Importance of d-wave contributions in the charge symmetry breaking reaction dd -> He-4 pi(0)
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2018 (Engelska)Ingår i: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 781, s. 645-650Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

This letter reports a first quantitative analysis of the contribution of higher partial waves in the charge symmetry breaking reaction dd -> He-4 pi(0) using the WASA-at-COSY detector setup at an excess energy of Q = 60 MeV. The determined differential cross section can be parametrized as d sigma/d Omega = a + b cos(2) theta*, where theta* is the production angle of the pion in the center-of-mass coordinate system, and the results for the parameters are a = (1.55 +/- 0.46(stat)(-0.8)(+0.32)(syst)) pb/sr and b = (13.1 +/- 2.1(stat)(-2.7)(+1.0)(syst)) pb/sr. The data are compatible with vanishing p-waves and a sizable d-wave contribution. This finding should strongly constrain the contribution of the A isobar to the dd -> He-4 pi(0) reaction and is, therefore, crucial for a quantitative understanding of quark mass effects in nuclear production reactions.

Ort, förlag, år, upplaga, sidor
ELSEVIER SCIENCE BV, 2018
Nyckelord
Charge symmetry breaking, Deuteron deuteron interactions, Pion production
Nationell ämneskategori
Subatomär fysik Astronomi, astrofysik och kosmologi
Identifikatorer
urn:nbn:se:uu:diva-358693 (URN)10.1016/j.physletb.2018.04.037 (DOI)000435653100082 ()
Forskningsfinansiär
EU, FP7, Sjunde ramprogrammet, 227431VetenskapsrådetKnut och Alice Wallenbergs Stiftelse
Tillgänglig från: 2018-09-05 Skapad: 2018-09-05 Senast uppdaterad: 2018-09-05Bibliografiskt granskad
Adlarson, P., Augustyniak, W., Bardan, W., Bashkanov, M., Bergmann, F. S., Berlowski, M., . . . Zurek, M. (2018). Isotensor Dibaryon in the pp -> pp pi(+)pi(-) Reaction?. Physical Review Letters, 121(5), Article ID 052001.
Öppna denna publikation i ny flik eller fönster >>Isotensor Dibaryon in the pp -> pp pi(+)pi(-) Reaction?
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2018 (Engelska)Ingår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 121, nr 5, artikel-id 052001Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Exclusive measurements of the quasifree pp -> pp pi(+)pi(-) reaction have been carried out at WASA@ COSY by means of pd collisions at T-p = 1.2 GeV. Total and differential cross sections have been extracted covering the energy region T-p = 1.08-1.36 GeV, which is the region of N* (1440) and Delta(123)Delta(1232) resonance excitations. Calculations describing these excitations by t-channel meson exchange are at variance with the measured differential cross sections and underpredict substantially the experimental total cross section. An isotensor Delta N dibaryon resonance with I(J(P)) = 2(1(+)) produced associatedly with a pion is able to overcome these deficiencies.

Ort, förlag, år, upplaga, sidor
AMER PHYSICAL SOC, 2018
Nationell ämneskategori
Subatomär fysik
Identifikatorer
urn:nbn:se:uu:diva-362841 (URN)10.1103/PhysRevLett.121.052001 (DOI)000440415600003 ()30118290 (PubMedID)
Forskningsfinansiär
Deutsche Forschungsgemeinschaft (DFG), CL 214/3-2
Tillgänglig från: 2018-10-15 Skapad: 2018-10-15 Senast uppdaterad: 2018-10-15Bibliografiskt granskad
Adlarson, P., Collaboration, W.-a., Augustyniak, W., Bardan, W., Bashkanov, M., Bergmann, F. S., . . . Wirzba, A. (2018). Search for C violation in the decay eta -> pi(0)e(+)e(-) with WASA-at-COSY. Physics Letters B, 784, 378-384
Öppna denna publikation i ny flik eller fönster >>Search for C violation in the decay eta -> pi(0)e(+)e(-) with WASA-at-COSY
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2018 (Engelska)Ingår i: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 784, s. 378-384Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

We report on the search for the rare decay eta -> pi(0)e(+)e(-) which is of interest to study C violation in the electromagnetic interaction which would indicate contributions from physics beyond the Standard Model, since the allowed decay via a two-photon intermediate state is strongly suppressed. The experiment has been performed using the WASA-at-COSY installation, located at the COSY accelerator of the Forschungszentrum Julich, Germany. In total 3 x 10(7) events of the reaction pd -> He-3 eta have been recorded at an excess energy of Q = 59.8MeV. Based on this data set the C parity violating decay eta -> pi(0)gamma* -> pi(0)e(+)e(-) via a single-photon intermediate state has been searched for, resulting in new upper limits of Gamma(eta -> pi(0)e(+) e(-))/Gamma(eta -> pi(+) pi(-) pi(0)) < 3.28 x 10(-5) and Gamma(eta -> pi(0)e(+) e(-))/Gamma(eta -> all)< 7.5 x 10(-6) (CL=90%), respectively. 

Ort, förlag, år, upplaga, sidor
ELSEVIER SCIENCE BV, 2018
Nationell ämneskategori
Subatomär fysik Astronomi, astrofysik och kosmologi
Identifikatorer
urn:nbn:se:uu:diva-368116 (URN)10.1016/j.physletb.2018.07.017 (DOI)000445781600056 ()
Forskningsfinansiär
EU, FP7, Sjunde ramprogrammet, 227431VetenskapsrådetKnut och Alice Wallenbergs Stiftelse
Tillgänglig från: 2018-12-06 Skapad: 2018-12-06 Senast uppdaterad: 2018-12-06Bibliografiskt granskad
Adlarson, P., Augustyniak, W., Bardan, W., Bashkanov, M., Bass, S. D., Bergmann, F. S., . . . Zurek, M. (2018). Spin Dependence of eta Meson Production in Proton-Proton Collisions Close to Threshold. Physical Review Letters, 120(2), Article ID 022002.
Öppna denna publikation i ny flik eller fönster >>Spin Dependence of eta Meson Production in Proton-Proton Collisions Close to Threshold
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2018 (Engelska)Ingår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 120, nr 2, artikel-id 022002Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Taking advantage of the high acceptance and axial symmetry of the WASA-at-COSY detector, and the high polarization degree of the proton beam of COSY, the reaction →pp→ppη has been measured close to threshold to explore the analyzing power Ay. The angular distribution of Ay is determined with the precision improved by more than 1 order of magnitude with respect to previous results, allowing a first accurate comparison with theoretical predictions. The determined analyzing power is consistent with zero for an excess energy of Q=15  MeV, signaling s-wave production with no evidence for higher partial waves. At Q=72  MeV the data reveal strong interference of Ps and Pp partial waves and cancellation of (Pp)2 and Ss∗Sd contributions. These results rule out the presently available theoretical predictions for the production mechanism of the η meson.

Nationell ämneskategori
Subatomär fysik
Identifikatorer
urn:nbn:se:uu:diva-341490 (URN)10.1103/PhysRevLett.120.022002 (DOI)000419478800004 ()
Tillgänglig från: 2018-02-21 Skapad: 2018-02-21 Senast uppdaterad: 2018-02-21Bibliografiskt granskad
Adlarson, P., Augustyniak, W., Bardan, W., Bashkanov, M., Bergmann, F. S., Berlowski, M., . . . Wilkin, C. (2018). Total and differential cross sections of η-production in proton–deuteron fusion for excess energies between Qη = 13 MeV and Qη = 81 MeV. Physics Letters B, 782, 297-304
Öppna denna publikation i ny flik eller fönster >>Total and differential cross sections of η-production in proton–deuteron fusion for excess energies between Qη = 13 MeV and Qη = 81 MeV
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2018 (Engelska)Ingår i: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 782, s. 297-304Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

New data on both total and differential cross sections of the production of eta mesons in proton-deuteron fusion to He-3 eta in the excess energy region 13.6 MeV <= Q(eta) <= 80.9 MeV are presented. These data have been obtained with the WASA-at-COSY detector setup located at the Forschungszentrum Julich, using a proton beam at 15 different beam momenta between p(p) = 1.60 GeV/c and p(p) = 1.74 GeV/c. While significant structure of the total cross section is observed in the energy region 20 MeV less than or similar to Q(eta) less than or similar to 60 MeV, a previously reported sharp variation around Q(eta) approximate to 50 MeV cannot be confirmed. Angular distributions show the typical forward- peaking that was noted earlier. For the first time, it is possible to study the development of these angular distributions with rising excess energy over a wide interval.

Nyckelord
Meson production, Proton-deuteron interactions, eta meson
Nationell ämneskategori
Subatomär fysik Astronomi, astrofysik och kosmologi
Identifikatorer
urn:nbn:se:uu:diva-361529 (URN)10.1016/j.physletb.2018.05.036 (DOI)000438486900050 ()
Forskningsfinansiär
EU, FP7, Sjunde ramprogrammet, 283286Deutsche Forschungsgemeinschaft (DFG), GRK2149
Anmärkning

WoS title: Total and differential cross sections of eta-production in proton-deuteron fusion for excess energies between Q(eta)=13 MeV and Q(eta)=81 MeV

Tillgänglig från: 2018-09-25 Skapad: 2018-09-25 Senast uppdaterad: 2018-12-21Bibliografiskt granskad
Adlarson, P., Augustyniak, W., Bardan, W., Bashkanov, M., Bergmann, F. S., Berlowski, M., . . . Zurekj, M. (2017). Isoscalar single-pion production in the region of Roper and d*(2380) resonances. Physics Letters B, 774, 599-607
Öppna denna publikation i ny flik eller fönster >>Isoscalar single-pion production in the region of Roper and d*(2380) resonances
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2017 (Engelska)Ingår i: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 774, s. 599-607Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Exclusive measurements of the quasi-free pn -> pp pi(-) and pp -> pp pi(0) reactions have been performed by means of pd collisions at T-p= 1.2 GeV using the WASA detector setup at COSY. Total and differential cross sections have been obtained covering the energy region T-p= 0.95-1.3 GeV (root s = 2.3-2.46 GeV), which includes the regions of triangle(1232), N*(1440) and d*(2380) resonance excitations. From these measurements the isoscalar single-pion production has been extracted, for which data existed so far only below T-p = 1 GeV. We observe a substantial increase of this cross section around 1 GeV, which can be related to the Roper resonance N*(1440), the strength of which shows up isolated from the triangle resonance in the isoscalar (N pi)(I=0) invariant-mass spectrum. No evidence for a decay of the dibaryon resonance d*(2380) into the isoscalar (NN pi)(I=0) channel is found. An upper limit of 180 mu b (90% CL.) corresponding to a branching ratio of 9% has been deduced.

Ort, förlag, år, upplaga, sidor
ELSEVIER SCIENCE BV, 2017
Nyckelord
Single-pion production, Isoscalar part, Roper resonance, Dibaryon resonance
Nationell ämneskategori
Astronomi, astrofysik och kosmologi
Identifikatorer
urn:nbn:se:uu:diva-344327 (URN)10.1016/j.physletb.2017.10.015 (DOI)000414973200078 ()
Forskningsfinansiär
Deutsche Forschungsgemeinschaft (DFG), CL 214/3-1Deutsche Forschungsgemeinschaft (DFG), CL 214/3-2
Tillgänglig från: 2018-03-08 Skapad: 2018-03-08 Senast uppdaterad: 2018-03-08Bibliografiskt granskad
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