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Ablikim, M., Achasov, M. N., Ahmed, S., Albrecht, M., Amoroso, A., An, F. F., . . . Zou, J. H. (2018). Amplitude analysis of the KSKS system produced in radiative J /psi decays. Physical Review D: covering particles, fields, gravitation, and cosmology, 98(7), Article ID 072003.
Open this publication in new window or tab >>Amplitude analysis of the KSKS system produced in radiative J /psi decays
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2018 (English)In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 98, no 7, article id 072003Article in journal (Refereed) Published
Abstract [en]

An amplitude analysis of the KSKS system produced in radiative J/psi decays is performed using the (1310.6 +/- 7.0) x 10(6) nip decays collected by the BESIII detector. Two approaches are presented. A mass-dependent analysis is performed by parametrizing the KSKS invariant mass spectrum as a sum of Breit-aligner line shapes. Additionally, a mass-independent analysis is performed to extract a piecewise function that describes the dynamics of the KSKS system while making minimal assumptions about the properties and number of poles in the amplitude. The dominant amplitudes in the mass-dependent analysis include the f(0)(1710), f(0)(2200), and f(2)'(1525). The mass-independent results, which are made available as input for further studies, are consistent with those of the mass-dependent analysis and are useful for a systematic study of hadronic interactions. The branching fraction of radiative J/psi decays to KSKS is measured to be (8.1 +/- 0.4) x 10(-4), where the uncertainty is systematic and the statistical uncertainty is negligible.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC, 2018
National Category
Subatomic Physics Astronomy, Astrophysics and Cosmology
Identifiers
urn:nbn:se:uu:diva-369106 (URN)10.1103/PhysRevD.98.072003 (DOI)000447187400001 ()
Funder
Swedish Research Council
Available from: 2018-12-17 Created: 2018-12-17 Last updated: 2018-12-17Bibliographically approved
Fang, S.-s., Kupsc, A. & Wei, D.-h. (2018). An overview of eta and eta ' decays at BESIII. Chinese Physics C, High Energy Physics & Nuclear Physics, 42(4), Article ID 042002.
Open this publication in new window or tab >>An overview of eta and eta ' decays at BESIII
2018 (English)In: Chinese Physics C, High Energy Physics & Nuclear Physics, ISSN 1674-1137, E-ISSN 0899-9996, Vol. 42, no 4, article id 042002Article, review/survey (Refereed) Published
Abstract [en]

The world's largest sample of J/psi) events, 1.31 billion events accumulated at the BESIII detector, provides a unique opportunity to investigate eta and eta' physics via two-body J/psi radiative or hadronic decays. For many eta' decay channels the low background data samples are up to three orders of magnitude larger than collected in any previous experiment. Here we review the most significant results on eta and eta' obtained at BESIII so far. The analyses range from detailed studies of common decay dynamics, observations of new radiative and Dalitz decays, and searches for rare/forbidden decays with sensitivity up to B similar to 10(-5). Finally, prospects of forthcoming runs at the J/psi peak for eta and eta' physics are discussed.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD, 2018
Keywords
eta/-eta ' decays, the BESIII detector, J/psi decays
National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-357488 (URN)10.1088/1674-1137/42/4/042002 (DOI)000430884300002 ()
Available from: 2018-08-23 Created: 2018-08-23 Last updated: 2018-08-23Bibliographically approved
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.
Open this publication in new window or tab >>Backward single-pion production in the pd -> He-3 pi(0)reaction with WASA-at-COSY
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2018 (English)In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 54, no 9, article id 149Article in journal (Refereed) 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.

Place, publisher, year, edition, pages
SPRINGER, 2018
National Category
Astronomy, Astrophysics and Cosmology Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-366738 (URN)10.1140/epja/i2018-12585-3 (DOI)000444638600001 ()
Funder
EU, FP7, Seventh Framework Programme, 283286
Available from: 2018-12-10 Created: 2018-12-10 Last updated: 2018-12-10Bibliographically approved
Anastasi, A., Babusci, D., Berlowski, M., Bloise, C., Bossi, F., Branchini, P., . . . Teubner, T. (2018). Combination of KLOE sigma (e(+) e(-) -> pi(+)pi(-) gamma(gamma)) measurements and determination of a(mu)(pi+pi-) in the energy range 0.10 < s < 0.95 GeV2. Journal of High Energy Physics (JHEP) (3), Article ID 173.
Open this publication in new window or tab >>Combination of KLOE sigma (e(+) e(-) -> pi(+)pi(-) gamma(gamma)) measurements and determination of a(mu)(pi+pi-) in the energy range 0.10 < s < 0.95 GeV2
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2018 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 3, article id 173Article in journal (Refereed) Published
Abstract [en]

The three precision measurements of the cross section sigma (e(+)e(-) -> pi(+)pi(-)gamma(gamma)) using initial state radiation by the KLOE collaboration provide an important input for the prediction of the hadronic contribution to the anomalous magnetic moment of the muon. These measurements are correlated for both statistical and systematic uncertainties and, therefore, the simultaneous use of these measurements requires covariance matrices that fully describe the correlations. We present the construction of these covariance matrices and use them to determine a combined KLOE measurement for sigma (e(+)e(-) -> pi(+)pi(-)gamma(gamma)). We find, from this combination, a two-pion contribution to the muon magnetic anomaly in the energy range 0.10 < s < 0.95 GeV2 of a(mu)(pi+pi-) (489.8 +/- 1.7(stat) +/- 4.8(sys)) x 10(-10).

Place, publisher, year, edition, pages
Springer, 2018
Keywords
e plus -e- Experiments
National Category
Subatomic Physics Astronomy, Astrophysics and Cosmology
Identifiers
urn:nbn:se:uu:diva-351704 (URN)10.1007/JHEP03(2018)173 (DOI)000429243600001 ()
Available from: 2018-06-04 Created: 2018-06-04 Last updated: 2018-06-04Bibliographically approved
Anastasi, A., Babusci, D., Berlowski, M., Bloise, C., Bossi, F., Branchini, R., . . . Wolke, M. (2018). Combined limit on the production of a light gauge boson decaying into mu(+) mu(-) and pi(+) pi(-). Physics Letters B, 784, 336-341
Open this publication in new window or tab >>Combined limit on the production of a light gauge boson decaying into mu(+) mu(-) and pi(+) pi(-)
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2018 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 784, p. 336-341Article in journal (Refereed) Published
Abstract [en]

We searched for the mu(+) mu(-) decay of a light vector gauge boson, also known as dark photon, in the e(+) e(-) -> mu(+) mu(-) gamma(ISR) process by means of the Initial State Radiation (ISR) method. We used 1.93fb(-1) of data collected by the KLOE experiment at the DA Phi NE phi-factory. No structures have been observed over the irreducible mu(+) mu(-) background. A 90% CL limit on the ratio epsilon(2)= alpha'/alpha between the dark coupling constant and the fine structure constant of 3 x 10(-6)-2 x 10(-7) has been set in the dark photon mass region between 519 MeV and 973 MeV. This new limit has been combined with the published result obtained investigating the hypothesis of the dark photon decaying into hadrons in e(+) e(-) -> pi(+) pi(-) gamma(ISR) events. The combined 90% CL limit increases the sensitivity especially in the rho-omega interference region and excludes epsilon(2) greater than (13 - 2) x 10(-7). For dark photon masses greater than 600 MeV the combined limit is lower than 8 x 10(-7) resulting more stringent than present constraints from other experiments.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV, 2018
Keywords
e(+) e(-) Collisions, Dark forces, Gauge vector boson, Upper limits
National Category
Subatomic Physics Astronomy, Astrophysics and Cosmology
Identifiers
urn:nbn:se:uu:diva-368113 (URN)10.1016/j.physletb.2018.08.012 (DOI)000445781600051 ()
Available from: 2018-12-06 Created: 2018-12-06 Last updated: 2018-12-06Bibliographically approved
Ablikim, M., Andersson, W. I., Johansson, T., Kupsc, A., Li, C., Papenbrock, M., . . . Zou, J. H. (2018). Dalitz plot analysis of the decay ω→π+π−π0. Physical Review D: covering particles, fields, gravitation, and cosmology, 98(11), Article ID 112007.
Open this publication in new window or tab >>Dalitz plot analysis of the decay ω→π+π−π0
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2018 (English)In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 98, no 11, article id 112007Article in journal (Refereed) Published
Abstract [en]

Using a low-background sample of 2.6 x 10(5) J/psi -> omega eta(omega -> pi(+) pi(-) pi(0), eta -> gamma gamma) events, about 5 times larger statistics than previous experiments, we present a Dalitz plot analysis of the decay omega -> pi(+) pi(-) pi(0). It is found that the Dalitz plot distribution differs from the pure P-wave phase space with a statistical significance of 18.9 sigma. The parameters from the fit to data are in reasonable agreement with those without the cross-channel effect within the dispersive framework, which indicates that the cross-channel effect in omega -> pi(+) pi(-) pi(0) is not significant.

National Category
Subatomic Physics Astronomy, Astrophysics and Cosmology
Identifiers
urn:nbn:se:uu:diva-373234 (URN)10.1103/PhysRevD.98.112007 (DOI)000454167100001 ()
Funder
Swedish Research Council
Note

Title in WoS: Dalitz plot analysis of the decay omega -> pi(+) pi(-) pi(0)

For complete list of authors see http://dx.doi.org/10.1103/PhysRevD.98.112007

Available from: 2019-01-14 Created: 2019-01-14 Last updated: 2019-01-14Bibliographically approved
Ablikim, M., Achasov, M. N., Ai, X. C., Ambrose, D. J., Amoroso, A., An, F. F., . . . Zou, J. H. (2018). Determination of the number of ψ(3686) events at BESIII. Chinese Physics C, High Energy Physics & Nuclear Physics, 42(2), Article ID 023001.
Open this publication in new window or tab >>Determination of the number of ψ(3686) events at BESIII
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2018 (English)In: Chinese Physics C, High Energy Physics & Nuclear Physics, ISSN 1674-1137, E-ISSN 0899-9996, Vol. 42, no 2, article id 023001Article in journal (Refereed) Published
Abstract [en]

The numbers of psi(3686) events accumulated by the BESIII detector for the data taken during 2009 and 2012 are determined to be (107.0 +/- 0.8)x10(6) and (341.1 +/- 2.1)x10(6), respectively, by counting inclusive hadronic events, where the uncertainties are systematic and the statistical uncertainties are negligible. The number of events for the sample taken in 2009 is consistent with that of the previous measurement. The total number of psi(3686) events for the two data taking periods is (448.1 +/- 2.9) x 10(6).

Keywords
psi(3686), inclusive process, hadronic events, Bhabha process
National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-351110 (URN)10.1088/1674-1137/42/2/023001 (DOI)000427537400001 ()
Funder
Swedish Research CouncilGerman Research Foundation (DFG)
Note

Uppsala Universitet affiliering, antagligen felaktig på: Zhao, S.J & Li, D.M.

Troligen Uppsala Universitet affiliering på Kupsc, Andrzej; Schönning, Karin & Wolke, Magnus.

Available from: 2018-05-29 Created: 2018-05-29 Last updated: 2018-05-29Bibliographically approved
Hanhart, C., Holz, S., Kubis, B., Kupść, A., Wirzba, A. & Xiao, C. W. (2018). Erratum to: The branching ratio omega ->pi(+) pi(-) revisited. European Physical Journal C, 78(6), Article ID 450.
Open this publication in new window or tab >>Erratum to: The branching ratio omega ->pi(+) pi(-) revisited
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2018 (English)In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 78, no 6, article id 450Article in journal (Other academic) Published
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:uu:diva-362649 (URN)10.1140/epjc/s10052-018-5941-7 (DOI)000434418400004 ()
Note

Correction to: European Physical Journal C, vol. 77, issue 2, article number: 98.

DOI: 10.1140/epjc/s10052-017-4651-x

Available from: 2018-10-16 Created: 2018-10-16 Last updated: 2018-10-16Bibliographically approved
Ablikim, M., Achasov, M. N., Ahmed, S., Albrecht, M., Alekseev, M., Amoroso, A., . . . Zou, J. H. (2018). First measurement of e(+)e(-) -> pK(S)(0)(n)over-barK(-) + c.c. above open charm threshold. Physical Review D: covering particles, fields, gravitation, and cosmology, 98(3), Article ID 032014.
Open this publication in new window or tab >>First measurement of e(+)e(-) -> pK(S)(0)(n)over-barK(-) + c.c. above open charm threshold
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2018 (English)In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 98, no 3, article id 032014Article in journal (Refereed) Published
Abstract [en]

The process e(+)e(-) -> pK(S)(0)(n) over barK(-) + c.c. and its intermediate processes are studied for the first time, using data samples collected with the BESIII detector at BEPCII at center-of-mass energies of 3.773, 4.008, 4.226, 4.258, 4.358, 4.416, and 4.600 GeV, with a total integrated luminosity of 7.4 fb(-1). The Born cross section of e(+)e(-) -> pK(S)(0)(n) over barK(-) + c.c. is measured at each center-of-mass energy, but no significant resonant structure in the measured cross-section line shape between 3.773 and 4.600 GeV is observed. No evident structure is detected in the pK(-), nK(S)(0), pK(S)(0), nK(+), p (n) over bar, or (KSK-)-K-0 invariant mass distributions except for Lambda(1520). The Born cross sections of e(+)e(-) -> Lambda(1520)(n) over barK(S)(0) + c.c. and e(+)e(-) -> Lambda(1520)(p) over barK(+) + c.c. are measured, and the 90% confidence level upper limits on the Born cross sections of e(+)e(-) -> Lambda(1520)(Lambda) over bar (1520) are determined at the seven center-of-mass energies. There is an evident difference in line shape and magnitude of the measured cross sections between e(+)e(-) -> Lambda(1520)(-> pK(-))(n) over barK(S)(0) and e(+)e(-) -> pK-(Lambda) over bar (1520)(-> (n) over barK(S)(0)).

National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-364204 (URN)10.1103/PhysRevD.98.032014 (DOI)000442883200002 ()
Funder
Swedish Research CouncilGerman Research Foundation (DFG)
Available from: 2018-10-25 Created: 2018-10-25 Last updated: 2018-10-25Bibliographically approved
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
Open this publication in new window or tab >>Importance of d-wave contributions in the charge symmetry breaking reaction dd -> He-4 pi(0)