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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
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
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)
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2018 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 781, p. 645-650Article in journal (Refereed) 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.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV, 2018
Keywords
Charge symmetry breaking, Deuteron deuteron interactions, Pion production
National Category
Subatomic Physics Astronomy, Astrophysics and Cosmology
Identifiers
urn:nbn:se:uu:diva-358693 (URN)10.1016/j.physletb.2018.04.037 (DOI)000435653100082 ()
Funder
EU, FP7, Seventh Framework Programme, 227431Swedish Research CouncilKnut and Alice Wallenberg Foundation
Available from: 2018-09-05 Created: 2018-09-05 Last updated: 2018-09-05Bibliographically approved
Ablikim, M., Achasov, M. N., Ahmed, S., Albrecht, M., Alekseev, M., Amoroso, A., . . . Zou, J. H. (2018). Improved measurements of X-cJ -> Sigma(+) (Sigma)over-bar(-) and Sigma(0)(Sigma)over-bar(0) decays. Physical Review D: covering particles, fields, gravitation, and cosmology, 97(5), Article ID 052011.
Open this publication in new window or tab >>Improved measurements of X-cJ -> Sigma(+) (Sigma)over-bar(-) and Sigma(0)(Sigma)over-bar(0) 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. 97, no 5, article id 052011Article in journal (Refereed) Published
Abstract [en]

Using a data sample of (448.1 +/- 2.9) x 10(6) psi (3686) events collected with the BESIII detector at the BEPCII collider, we present measurements of branching fractions for the decays X-cJ -> Sigma(+) (Sigma) over bar (-) and Sigma(0) (Sigma) over bar (0) The decays X-c1.2 -> Sigma(+) (Sigma) over bar (-) and Sigma (Sigma) over bar (0) are observed for the first time, and the branching fractions for X-c0 -> Sigma(+) (Sigma) over bar (-) and Sigma(0) (Sigma) over bar (0) decays are measured with improved precision. The branching fraction ratios between the charged and neutral modes are consistent with the prediction of isospin symmetry.

Place, publisher, year, edition, pages
American Physical Society, 2018
National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-352724 (URN)10.1103/PhysRevD.97.052011 (DOI)000428505700001 ()
Funder
Swedish Research Council
Available from: 2018-06-07 Created: 2018-06-07 Last updated: 2018-06-07Bibliographically approved
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.
Open this publication in new window or tab >>Isotensor Dibaryon in the pp -> pp pi(+)pi(-) Reaction?
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2018 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 121, no 5, article id 052001Article in journal (Refereed) 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.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC, 2018
National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-362841 (URN)10.1103/PhysRevLett.121.052001 (DOI)000440415600003 ()30118290 (PubMedID)
Funder
German Research Foundation (DFG), CL 214/3-2
Available from: 2018-10-15 Created: 2018-10-15 Last updated: 2018-10-15Bibliographically approved
Ablikim, M., Achasov, M. N., Ahmed, S., Albrecht, M., Alekseev, M., Amoroso, A., . . . Zou, J. H. (2018). Measurement of e(+)e(-) -> D(D)over-bar cross sections at the psi(3770) resonance. Chinese Physics C, High Energy Physics & Nuclear Physics, 42(8), Article ID 083001.
Open this publication in new window or tab >>Measurement of e(+)e(-) -> D(D)over-bar cross sections at the psi(3770) resonance