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Lambda hyperon spin polarization and CP tests at BESIII
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.ORCID iD: 0000-0001-6280-3851
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
2019 (English)In: MESON 2018 - 15th International Workshop on Meson Physics / [ed] Wronska, A Magiera, A Przygoda, W, EDP Sciences, 2019, article id 03009Conference paper, Published paper (Refereed)
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.

Place, publisher, year, edition, pages
EDP Sciences, 2019. article id 03009
Series
EPJ Web of Conferences, ISSN 2100-014X ; 199
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:uu:diva-390014DOI: 10.1051/epjconf/201919903009ISI: 000471304400062OAI: oai:DiVA.org:uu-390014DiVA, id: diva2:1340219
Conference
15th International Workshop on Meson Physics (MESON), JUN 07-12, 2018, Krakow, POLAND
Funder
Knut and Alice Wallenberg FoundationAvailable from: 2019-08-02 Created: 2019-08-02 Last updated: 2019-08-02Bibliographically approved

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