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Measurement of eta meson decays into lepton-antilepton pairs
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2008 (English)In: Physical Review D. Particles and fields, ISSN 0556-2821, E-ISSN 1089-4918, Physical Review D, ISSN 1550-7998, Vol. 77, no 3, 032004- p.Article in journal (Refereed) Published
Abstract [en]

A search for rare lepton decays of the eta meson was performed using the WASA detector at CELSIUS. Two candidates for double Dalitz decay eta -> e(+)e(-)e(+)e(-) events are reported with a background of 1.3 +/- 0.2 events. This allows to set an upper limit to the branching ratio of 9.7x10(-5) (90% CL). The branching ratio for the decay eta -> e(+)e(-)gamma is determined to (7.8 +/- 0.5(stat)+/- 0.8(syst))x10(-3) in agreement with world average value. An upper limit (90% CL) for the branching ratio for the eta -> e(+)e(-) decay is 2.7x10(-5) and a limit for the sum of the eta ->mu(+)mu(-)mu(+)mu(-) and eta ->pi(+)pi(-)mu(+)mu(-) decays is 3.6x10(-4).

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2008. Vol. 77, no 3, 032004- p.
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Physical Sciences
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URN: urn:nbn:se:uu:diva-110483DOI: 10.1103/PhysRevD.77.032004ISI: 000253764700005OAI: oai:DiVA.org:uu-110483DiVA: diva2:277101
Available from: 2009-11-16 Created: 2009-11-16 Last updated: 2017-12-12

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Geren, L.Kupsc, Andrzej

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