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Measurement of η meson decays into lepton-antilepton pairs
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
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2007 (English)Report (Other academic)
Abstract [en]

A search for rare lepton decays of the η meson was performed using the WASA detector at CELSIUS. Two candidates for double Dalitz decay η→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 9.7×10−5 η(90% CL). The branching ratio for the decay η→e+e−γ is determined to (7.8±0.5stat ±0.8syst)×10−3 in agreement with world average value. An upper limit (90% CL) for the branching ratio for the η→e+e− decay is 2.7 × 10−5 and a limit for the sum of the η→μ+μ−μ+μ− and η→π+π−μ+μ− decays is 3.6 × 10−4.

Place, publisher, year, edition, pages
2007. , 9 p.
Series
e-Print: arXiv, 0711.3531
Identifiers
URN: urn:nbn:se:uu:diva-85641OAI: oai:DiVA.org:uu-85639DiVA: diva2:113748
Available from: 2008-10-27 Created: 2008-10-27 Last updated: 2014-02-07

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http://www.slac.stanford.edu/spires/find/hep/www?eprint=arXiv:0711.3531

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Schönning, Karin

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