Observation of the rare eta->e+e-e+e- decay with the KLOE experiment

Details Observation of the rare eta->e+e-e+e- decay with the KLOE experiment Observation of the rare eta->e+e-e+e- decay with the KLOE experiment

2011-05-30

arxiv.org/abs/1105.6067v3

Phys.Lett. B702 (2011) 324-328

Physics

High Energy Physics

High Energy Physics - Experiment

12 pages, 3 figures, to be published on PLB

Scientific paper

We report the first observation of the rare eta->e+e-e+e- decay based on 1.7
fb^{-1} collected by the KLOE experiment at the DAFNE phi-factory. The
selection of the e+e-e+e- final state is fully inclusive of radiation. We have
identified 362 +- 29 events resulting in a branching ratio of (2.4 +-
0.2_stat+bckg +- 0.1_syst) x 10^{-5}.

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