Observation of the rare eta->e+e-e+e- decay with the KLOE experiment
The KLOE Collaboration: F.Ambrosino, A.Antonelli, M.Antonelli,, F.Archilli, I.Balwierz, G.Bencivenni, C.Bini, C.Bloise, S.Bocchetta, F.Bossi,, P.Branchini, G.Capon, T.Capussela, F.Ceradini, P.Ciambrone, E.Czerwinski,, E.DeLucia, A.DeSantis, P.DeSimone, G.DeZorzi, A.Denig
TL;DR
This paper reports the first observation of the rare eta decay into four electrons, using data from the KLOE experiment, and measures its branching ratio with high precision.
Contribution
First observation of the eta->e+e-e+e- decay, providing new experimental data on this rare process.
Findings
Identified 362 ± 29 decay events.
Measured branching ratio of (2.4 ± 0.2_stat+bckg ± 0.1_syst) x 10^{-5}.
Demonstrated the decay's occurrence with statistical significance.
Abstract
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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