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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
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
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
Aghasyan, M., Alexeev, M. G., Alexeev, G. D., Amoroso, A., Andrieux, V., Anfimov, N. V., . . . Ziembicki, M. (2018). 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). Physics Letters B, 781, 464-472
Open this publication in new window or tab >>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)
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2018 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 781, p. 464-472Article in journal (Refereed) Published
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.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV, 2018
Keywords
Inelastic muon scattering, Spin structure function, A(1), g(1), Low x, Low Q(2)
National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-358692 (URN)10.1016/j.physletb.2018.03.044 (DOI)000435653100059 ()
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). 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