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Dielectron pairs from eta meson decays at WASA detector
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics. Natl Ctr Nucl Res, Warsaw, Poland.
Natl Ctr Nucl Res, Warsaw, Poland.
2019 (English)In: MESON 2018 - 15th International Workshop on Meson Physics / [ed] Wronska, A Magiera, A Przygoda, W, EDP Sciences, 2019, article id 02011Conference paper, Published paper (Refereed)
Abstract [en]

We present the results of the analysis of eta -> e(+)e(-)gamma and eta -> e(+)e(-) decays. The experimental data were collected in proton-proton collisions at incident proton kinetic energy 1.4 GeV using the WASA detector and the COSY storage ring. We describe the extraction procedure of the eta meson transition form factor, based on a sample of around 10(8)eta mesons, and show an attempt to search for physics beyond the Standard Model that led to the setting of an upper limit on the coupling between photons and hypothetical dark bosons. We also provide an estimate of the branching ratio upper limit for the very rare eta -> e(+)e(-) decay.

Place, publisher, year, edition, pages
EDP Sciences, 2019. article id 02011
Series
EPJ Web of Conferences, ISSN 2100-014X ; 199
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:uu:diva-390017DOI: 10.1051/epjconf/201919902011ISI: 000471304400035OAI: oai:DiVA.org:uu-390017DiVA, id: diva2:1340193
Conference
15th International Workshop on Meson Physics (MESON), JUN 07-12, 2018, Krakow, POLAND
Available from: 2019-08-02 Created: 2019-08-02 Last updated: 2019-08-02Bibliographically approved

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