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Ablikim, M., Adlarson, P., Biernat, J., Ikegami Andersson, W., Johansson, T., Kupsc, A., . . . Zou, J. H. (2019). Amplitude analysis of D+-> K-S(0)pi(+)pi(+)pi(-). Physical Review D: covering particles, fields, gravitation, and cosmology, 100(7), Article ID 072008.
Öppna denna publikation i ny flik eller fönster >>Amplitude analysis of D+-> K-S(0)pi(+)pi(+)pi(-)
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2019 (Engelska)Ingår i: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 100, nr 7, artikel-id 072008Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The decay D+-> K-S(0)pi(+)pi(+)pi(-) is studied with an amplitude analysis using a data set of 2.93 fb(-1) of e(+)e(-) collisions at the psi(3770) peak accumulated by the BESIII detector. Intermediate states and nonresonant components, and their relative fractions and phases, have been determined. The significant amplitudes, which contribute to the model that best fits the data, are composed of five quasitwo-body decays K(S)(0)a(1)(1260)(+), (K) over bar (1)(1270)(0)pi(+) (K) over bar (1)(1400)(0)pi(+), (K) over bar (1)(1650)(0)pi(+), and (K) over bar (1460)(0)pi(+), a three-body decay K-S(0)pi(+)rho(0), as well as a nonresonant component K-S(0)pi(+)pi(+)pi(-). The dominant amplitude is K(S)(0)a(1)(1260)(+), with a fit fraction of (40.3 +/- 2.1 +/- 2.9)%, where the first and second uncertainties are statistical and systematic, respectively.

Ort, förlag, år, upplaga, sidor
AMER PHYSICAL SOC, 2019
Nationell ämneskategori
Subatomär fysik
Identifikatorer
urn:nbn:se:uu:diva-396707 (URN)10.1103/PhysRevD.100.072008 (DOI)000491169300002 ()
Forskningsfinansiär
VetenskapsrådetKnut och Alice Wallenbergs Stiftelse
Anmärkning

For complete list of authors see http://dx.doi.org/10.1103/PhysRevD.100.072008

Tillgänglig från: 2019-11-08 Skapad: 2019-11-08 Senast uppdaterad: 2019-11-08Bibliografiskt granskad
Ablikim, M., Adlarson, P., Biernat, J., Ikegami Andersson, W., Johansson, T., Kupsc, A., . . . Zou, J. H. (2019). Complete Measurement of the Λ Electromagnetic Form Factors. Physical Review Letters, 123(12), Article ID 122003.
Öppna denna publikation i ny flik eller fönster >>Complete Measurement of the Λ Electromagnetic Form Factors
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2019 (Engelska)Ingår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 123, nr 12, artikel-id 122003Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The exclusive process e(+)e(-) -> Lambda(Lambda) over bar, with Lambda -> p pi(-) and (Lambda) over bar -> (p) over bar pi(+), has been studied at root s = 2.396 GeV for measurement of the timelike Lambda electric and magnetic form factors, G(E) and G(M). A data sample, corresponding to an integrated luminosity of 66.9 pb(-1), was collected with the BESIII detector for this purpose. A multidimensional analysis with a complete decomposition of the spin structure of the reaction enables a determination of the modulus of the ratio R = vertical bar G(E)/G(M)vertical bar and, for the first time for any baryon, the relative phase Delta Phi = Phi(E) - Phi(M). The resulting values are R = 0.96 +/- 0.14(stat) +/- 0.02(syst) and Phi(F) = 37 degrees +/- 12 degrees (stat) +/- 6 degrees (syst), respectively. These are obtained using the recently established and most precise value of the asymmetry parameter alpha(Lambda) = 0.750 +/- 0.010 measured by BESIII. In addition, the cross section is measured with unprecedented precision to be sigma = 118.7 +/- 5.3(stat) +/- 5.1(syst) pb, which corresponds to an effective form factor of vertical bar G vertical bar = 0.123 +/- 0.003(stat) +/- 0.003(syst). The contribution from two-photon exchange is found to be negligible. Our result enables the first complete determination of baryon timelike electromagnetic form factors.

Nationell ämneskategori
Subatomär fysik
Identifikatorer
urn:nbn:se:uu:diva-395800 (URN)10.1103/PhysRevLett.123.122003 (DOI)000487743500004 ()
Forskningsfinansiär
VetenskapsrådetKnut och Alice Wallenbergs Stiftelse, 2016.0157
Anmärkning

For complete list of authors see http://dx.doi.org/10.1103/PhysRevLett.123.122003

Tillgänglig från: 2019-10-25 Skapad: 2019-10-25 Senast uppdaterad: 2019-10-25Bibliografiskt granskad
Adlarson, P. & Kupsc, A. (2019). CP symmetry tests in the cascade-anticascade decay of charmonium. Physical Review D: covering particles, fields, gravitation, and cosmology, 100(11), Article ID 114005.
Öppna denna publikation i ny flik eller fönster >>CP symmetry tests in the cascade-anticascade decay of charmonium
2019 (Engelska)Ingår i: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 100, nr 11, artikel-id 114005Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

We analyze joint angular distributions of a charmonium decay to the Xi(Xi) over bar pair using the Xi -> Lambda pi -> p pi(-) pi weak decay chain for the cascade and the charge conjugated mode for the anticascade. The decays allow a direct comparison of the baryon and antibaryon decay properties and a sensitive test of CP symmetry in the strange baryon sector. We show that all involved decay parameters can be determined separately in vector and (pseudo)scalar charmonia decays into Xi(Xi) over bar due to the spin correlations between the weak decay chains. Contrary to the recently measured ethorne e(+)e(-) -> J/psi -> Lambda(Lambda) over bar process, the transverse polarization of the cascade is not needed and has almost no impact on the uncertainties of the decay parameters.

Ort, förlag, år, upplaga, sidor
AMER PHYSICAL SOC, 2019
Nationell ämneskategori
Subatomär fysik
Identifikatorer
urn:nbn:se:uu:diva-400423 (URN)10.1103/PhysRevD.100.114005 (DOI)000500722600004 ()
Tillgänglig från: 2019-12-20 Skapad: 2019-12-20 Senast uppdaterad: 2019-12-20Bibliografiskt granskad
Ablikim, M., Adlarson, P., Biernat, J., Ikegami Andersson, W., Johansson, T., Kupsc, A., . . . Zou, J. H. (2019). Cross section measurements of e(+) e(-) -> omega chi(c0) from root s=4.178 to 4.278 GeV. Physical Review D: covering particles, fields, gravitation, and cosmology, 99(9), Article ID 091103.
Öppna denna publikation i ny flik eller fönster >>Cross section measurements of e(+) e(-) -> omega chi(c0) from root s=4.178 to 4.278 GeV
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2019 (Engelska)Ingår i: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 99, nr 9, artikel-id 091103Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The cross section of the process e(+)e(-) -> omega chi(C0) is measured at center -of -mass energies from root s = 4.178 to 4.278 GeV using a data sample of 7 fb(-1) collected with the BESIII detector operating at the BEPCII storage ring. The dependence of the cross section on root s shows a resonant structure with mass of (4218.5 +/- 1.6(stat) +/- 4.0(syst)) MeV/c(2) and width of (28.2 +/- 3.9(stat) +/- 1.6(syst)) MeV, respectively. This observation confirms and improves upon the result of a previous study. The angular distribution of the e(+) e(-) ->omega chi(C0) process is extracted for the first time.

Ort, förlag, år, upplaga, sidor
AMER PHYSICAL SOC, 2019
Nationell ämneskategori
Subatomär fysik
Identifikatorer
urn:nbn:se:uu:diva-386159 (URN)10.1103/PhysRevD.99.091103 (DOI)000468220800001 ()
Forskningsfinansiär
VetenskapsrådetDeutsche Forschungsgemeinschaft (DFG)
Anmärkning

For complete list of authors see http://dx.doi.org/10.1103/PhysRevD.99.091103

Tillgänglig från: 2019-06-20 Skapad: 2019-06-20 Senast uppdaterad: 2019-06-20Bibliografiskt granskad
Ablikim, M., Adlarson, P., Biernat, J., Ikegami Andersson, W., Johansson, T., Kupsc, A., . . . Zou, J. H. (2019). Cross section measurements of e+e- -> K+ K- K+ K- and ΦK+ K- at center-of-mass energies from 2.10 to 3.08 GeV. Physical Review D: covering particles, fields, gravitation, and cosmology, 100(3), Article ID 032009.
Öppna denna publikation i ny flik eller fönster >>Cross section measurements of e+e- -> K+ K- K+ K- and ΦK+ K- at center-of-mass energies from 2.10 to 3.08 GeV
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2019 (Engelska)Ingår i: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 100, nr 3, artikel-id 032009Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

We measure the Born cross sections of the process e(+)e(-) -> K+ K- K+ K- at center-of-mass (c.m.) energies, root s, between 2.100 and 3.080 GeV. The data were collected using the BESIII detector at the BEPCII collider. An enhancement at root s = 2.232 GeV is observed, very close to the e(+)e(-) -> Lambda(Lambda) over bar production threshold. A similar enhancement at the same c.m. energy is observed in the e(+)e(-) -> phi K+ K- cross section. The energy dependence of the K+ K- K+ K- and phi K+ K- cross sections differs significantly from that of e(+)e(-) -> phi pi(+)pi(-).

Nationell ämneskategori
Subatomär fysik
Identifikatorer
urn:nbn:se:uu:diva-394263 (URN)10.1103/PhysRevD.100.032009 (DOI)000483349300001 ()
Forskningsfinansiär
Knut och Alice Wallenbergs Stiftelse, 2016.0157Vetenskapsrådet
Anmärkning

For complete list of authors see http://dx.doi.org/10.1103/PhysRevD.100.032009

Tillgänglig från: 2019-10-08 Skapad: 2019-10-08 Senast uppdaterad: 2019-10-08Bibliografiskt 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
Ablikim, M., Adlarson, P., Biernat, J., Ikegami Andersson, W., Johansson, T., Kupsc, A., . . . Zou, J. H. (2019). First observation of the decay chi(cJ) -> Sigma(+)(p)over-barK(S)(0)+ c.c. (J=0,1,2). Physical Review D: covering particles, fields, gravitation, and cosmology, 100(9), Article ID 092006.
Öppna denna publikation i ny flik eller fönster >>First observation of the decay chi(cJ) -> Sigma(+)(p)over-barK(S)(0)+ c.c. (J=0,1,2)
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2019 (Engelska)Ingår i: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 100, nr 9, artikel-id 092006Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Using E1 radiative transitions psi(3686) -> gamma chi(cJ) from a sample of (448.1 +/- 2.9) x 10(6) psi(3686) events collected with the BESIII detector, the decays chi(cJ) -> Sigma(+)(p) over barK(S)(0) + c.c.(J = 0,1,2) are studied. The decay branching fractions are measured to be B(chi(c0) -> Sigma(+)(p) over barK(S)(0) + c.c.) = (3.52 +/- 0.19 +/- 0.21) x 10(-4), B(chi(c1) -> Sigma(+)(p) over barK(S)(0) + c.c.) = (1.53 +/- 0.10 +/- 0.08) x 10(-4), and B(chi(c2) -> Sigma(+)(p) over barK(S)(0) + c.c.) = (8.25 +/- 0.83 +/- 0.49) x 10(-5), where the first and second uncertainties are the statistical and systematic ones, respectively. No evident intermediate resonances arc observed in the studied processes.

Ort, förlag, år, upplaga, sidor
American Physical Society, 2019
Nationell ämneskategori
Subatomär fysik Astronomi, astrofysik och kosmologi
Identifikatorer
urn:nbn:se:uu:diva-398691 (URN)10.1103/PhysRevD.100.092006 (DOI)000496926100001 ()
Forskningsfinansiär
EU, Europeiska forskningsrådet, 758462Knut och Alice Wallenbergs Stiftelse, 2016.0157Vetenskapsrådet
Anmärkning

For complete list of authors see http://dx.doi.org/10.1103/PhysRevD.100.092006

Tillgänglig från: 2019-12-09 Skapad: 2019-12-09 Senast uppdaterad: 2019-12-09Bibliografiskt granskad
Ablikim, M., Adlarson, P., Biernat, J., Ikegami Andersson, W., Johansson, T., Kupsc, A., . . . Zou, J. H. (2019). First observations of h(c )-> hadrons. Physical Review D: covering particles, fields, gravitation, and cosmology, 99(7), Article ID 072008.
Öppna denna publikation i ny flik eller fönster >>First observations of h(c )-> hadrons
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2019 (Engelska)Ingår i: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 99, nr 7, artikel-id 072008Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Based on (4.48 +/- 0.03) x 10(8) Psi(3686) events, collected with the BESIII detector at the BEPCII storage ring, five h(c) hadronic decays are searched for via the process Psi(3686) -> pi(0)h(c). Three of them, h(c) -> p (p) over bar pi(+)pi(-) , pi(+)pi(-)pi(0 )and 2(pi(+)pi(-))pi(0) are observed for the first time with significances of 7.4 sigma, 4.6 sigma, and 9.1 sigma, and their branching fractions are determined to be (2.89 +/- 0.32 +/- 0.55) x 10(-3), (1.60 +/- 0.40 +/- 0.32) x 10(-3), and (7.44 +/- 0.94 +/- 1.52) x 10(-3), respectively, where the first uncertainties are statistical and the second systematic. No significant signal is observed for the other two decay modes, and the corresponding upper limits of the branching fractions are determined to be B(h(c) -> 3(pi(+)pi(-))pi(0)) < 8.7 x 10(-3) and B(h(c) -> K+K-pi(+)pi(-) ) < 5.8 x 10(-4) at the 90% confidence level.

Ort, förlag, år, upplaga, sidor
AMER PHYSICAL SOC, 2019
Nationell ämneskategori
Subatomär fysik
Identifikatorer
urn:nbn:se:uu:diva-383854 (URN)10.1103/PhysRevD.99.072008 (DOI)000466419600001 ()
Forskningsfinansiär
Knut och Alice Wallenbergs Stiftelse, 2016.0157VetenskapsrådetDeutsche Forschungsgemeinschaft (DFG), CRC 1044
Anmärkning

For complete list of authors see http://dx.doi.org/10.1103/PhysRevD.99.072008

Tillgänglig från: 2019-05-24 Skapad: 2019-05-24 Senast uppdaterad: 2019-05-24Bibliografiskt granskad
Ablikim, M., Adlarson, P., Biernat, J., Ikegami Andersson, W., Johansson, T., Kupsc, A., . . . Zou, J. H. (2019). Improved measurements of the absolute branching fractions of the inclusive decays D+(0) -> phi X. Physical Review D: covering particles, fields, gravitation, and cosmology, 100(7), Article ID 072006.
Öppna denna publikation i ny flik eller fönster >>Improved measurements of the absolute branching fractions of the inclusive decays D+(0) -> phi X
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2019 (Engelska)Ingår i: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 100, nr 7, artikel-id 072006Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

By analyzing 2.93 fb(-1) of e(+)e(-) annihilation data taken at the center-of-mass energy root s = 3.773 GeV with the BESIII detector, we determine the branching fractions of the inclusive decays D+-> phi X and D-0 -> phi X to be (1.135 +/- 0.034 +/- 0.031)% and (1.091 +/- 0.027 +/- 0.035)%, respectively, where X denotes any possible particle combination. The first uncertainties are statistical, and the second are systematic. We also determine the branching fractions of the decays D -> phi X and their charge conjugate modes (D) over bar -> phi(X) over bar separately for the first time, and no significant CP asymmetry is observed.

Ort, förlag, år, upplaga, sidor
AMER PHYSICAL SOC, 2019
Nationell ämneskategori
Subatomär fysik
Identifikatorer
urn:nbn:se:uu:diva-396710 (URN)10.1103/PhysRevD.100.072006 (DOI)000490172200002 ()
Forskningsfinansiär
Knut och Alice Wallenbergs Stiftelse, 2016.0157Vetenskapsrådet
Anmärkning

For complete list of authors see http://dx.doi.org/10.1103/PhysRevD.100.072006

Tillgänglig från: 2019-11-08 Skapad: 2019-11-08 Senast uppdaterad: 2019-11-08Bibliografiskt granskad
Adlarson, P. & Li, C. (2019). Lambda hyperon spin polarization and CP tests at BESIII. In: Wronska, A Magiera, A Przygoda, W (Ed.), MESON 2018 - 15th International Workshop on Meson Physics: . Paper presented at 15th International Workshop on Meson Physics (MESON), JUN 07-12, 2018, Krakow, POLAND. EDP Sciences, Article ID 03009.
Öppna denna publikation i ny flik eller fönster >>Lambda hyperon spin polarization and CP tests at BESIII
2019 (Engelska)Ingår i: MESON 2018 - 15th International Workshop on Meson Physics / [ed] Wronska, A Magiera, A Przygoda, W, EDP Sciences, 2019, artikel-id 03009Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

In these proceedings two preliminary results from the BESIII collaboration on polarized Lambda and (Lambda) over bar are reported. Both results are first observations and concern the resonant and non-resonant processes e(-)e(+) -> J/psi -> Lambda(Lambda) over bar and e(-)e(+) -> gamma* -> Lambda Lambda at root s = 2.396 GeV, respectively. For J/psi -> Lambda Lambda the relative phase between the electric and magnetic form factors, Delta Phi, has for the first time been determined, Delta Phi = 42.4(6)(stat) (5)(stat degrees). That Delta Phi not equal 0 allows for a simultaneous measurement also of the asymmetry decay parameters Lambda -> p pi(-) (alpha_), (Lambda) over bar -> (p) over bar pi(+) (alpha(+)) and (Lambda) over bar -> (n) over bar pi(0) ((alpha) over bar (0)). The measured value of alpha_ = 0.750 +/- 0.009 +/- 0.004 differs by 17(3)% from the PDG value. The simultaneous measurement for the asymmetry parameters allows for the most precise test of CP violation conducted for A decays, A(cp) = - 0.006(12)(stat) (7)(syst). The reaction e(-)e(+) -> Lambda(Lambda) over bar at root s = 2.396 GeV is the first complete measurement of the time-like electric (G(E)) and magnetic (G(M)) form factor of any baryon as also the ratio R = vertical bar(GE)/(G(M))vertical bar and Delta Phi have been determined: R = 0.96(14)(12) and Delta Phi = 37(12)(stat) (6)(stat)degrees. The obtained cross-section and effective form factor are sigma = 119.0(53)(stat)(51)(syst) pb and vertical bar G vertical bar = 0.123 (3)(stat) (3)(syst), respectively.

Ort, förlag, år, upplaga, sidor
EDP Sciences, 2019
Serie
EPJ Web of Conferences, ISSN 2100-014X ; 199
Nationell ämneskategori
Subatomär fysik
Identifikatorer
urn:nbn:se:uu:diva-390014 (URN)10.1051/epjconf/201919903009 (DOI)000471304400062 ()
Konferens
15th International Workshop on Meson Physics (MESON), JUN 07-12, 2018, Krakow, POLAND
Forskningsfinansiär
Knut och Alice Wallenbergs Stiftelse
Tillgänglig från: 2019-08-02 Skapad: 2019-08-02 Senast uppdaterad: 2019-08-02Bibliografiskt granskad
Organisationer
Identifikatorer
ORCID-id: ORCID iD iconorcid.org/0000-0001-6280-3851

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