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Observation of eta ' -> omega e(+)e(-)
Inst High Energy Phys, Beijing 100049, Peoples R China..
GI Budker Inst Nucl Phys SB RAS BINP, Novosibirsk 630090, Russia.;Novosibirsk State Univ, Novosibirsk 630090, Russia..
Inst High Energy Phys, Beijing 100049, Peoples R China..
Carnegie Mellon Univ, Pittsburgh, PA 15213 USA..
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2015 (English)In: Physical Review D, ISSN 1550-7998, E-ISSN 1550-2368, Vol. 92, no 5, 051101Article in journal (Refereed) Published
Abstract [en]

Based on a sample of eta' mesons produced in the radiative decay J/psi -> gamma eta' in 1.31 x 10(9) J/psi events collected with the BESIII detector, the decay eta' -> omega e(+)e(-) is observed for the first time, with a statistical significance of 8 sigma. The branching fraction is measured to be B(eta' -> omega e(+)e(-)) = (1.97 +/- 0.34(stat) +/- 0.17(syst)) x 10(-4), which is in agreement with theoretical predictions. The branching fraction of eta' -> omega gamma is also measured to be (2.55 +/- 0.03(stat) +/- 0.16(syst)) x 10(-2), which is the most precise measurement to date, and the relative branching fraction B(eta' -> omega e(+)e(-))/B(eta' -> omega gamma) is determined to be (7.71 +/- 1.34(stat) +/- 0.54(syst)) x 10(-3).

Place, publisher, year, edition, pages
2015. Vol. 92, no 5, 051101
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-264043DOI: 10.1103/PhysRevD.92.051101ISI: 000361119300001OAI: oai:DiVA.org:uu-264043DiVA: diva2:859809
Funder
Swedish Research Council
Available from: 2015-10-08 Created: 2015-10-05 Last updated: 2017-12-01Bibliographically approved

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Johansson, TordKupsc, AndrezejLi, CuiPettersson, JoachimSchönning, KarinWolke, Magnus

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