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Spin polarization of A hyperons in e(+)e(-) -> A(A)over-bar at BESIII
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.ORCID iD: 0000-0002-3490-9584
2019 (English)In: XIII International Conference on Beauty, Charm and Hyperon Hadrons (BEACH 2018) / [ed] Bordalo, P Barao, F Bicudo, P Bozzo, M Cenci, P Franco, C Goncalo, R Lazzeroni, C Leonardo, N McKenna, J Ramos, S Rubin, P Seixas, J Solomey, N, Institute of Physics Publishing (IOPP), 2019, article id 012010Conference paper, Published paper (Refereed)
Abstract [en]

The BESIII collaboration here reports the first observation of polarized A and A hyperons produced in two different processes: i) the resonant e+e AA, using a data sample of 1.31 x 109 J/ ti, events and ii) the non-resonant e+e 7* AA, using a 66.9 pb-1 data sample collected at \/7s = 2.396 GeV. In e+e J/ AA, the phase between the electric and the magnetic amplitude is measured for the first time to be 42.3' 0.6' 0.5'. The multi-dimensional analysis enables a model-independent measurement of the decay parameters for A (a_), A 257+ (a+) and A fi Tr (do). The obtained value a_ = 0.750 0.009 0.004 differs with 5a from the PDG value. This value, together with the measurement a+ = 0.758 0.010 0.007 allow for the most precise test of CP violation in A decays so far: Acp = (a_ + cx+)/(cx_ a+) of 0.006 0.012 0.007. The decay asymmetry Cxo = 0.692 0.016 0.006 is measured for the first time. The e+e AA reaction at 2.396 GeV enables a first complete measurement of the time-like electric and magnetic form factor of any baryon, of the modulus of the ratio R = IGEIGml and of the relative phase 0(13 = (DE (Dm. With the decay asymmetry parameters from the J/ data, the obtained values are R= 0.96 0.14 0.02 and,A(13 = 37- 12' 6'. In addition, the cross section has been measured with unprecedented precision to be a = 119.0 5.3 5.1 pb, which corresponds to an effective form factor of IQ = 0.123 0.003 0.003.

Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2019. article id 012010
Series
Journal of Physics Conference Series, ISSN 1742-6588, E-ISSN 1742-6596 ; 1137
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:uu:diva-389928DOI: 10.1088/1742-6596/1137/1/012010ISI: 000471108300010OAI: oai:DiVA.org:uu-389928DiVA, id: diva2:1340056
Conference
13th International Conference on Beauty, Charm and Hyperon Hadrons (BEACH), JUN 17-23, 2018, Peniche, PORTUGAL
Available from: 2019-08-01 Created: 2019-08-01 Last updated: 2019-08-01Bibliographically approved

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