Search for the K(S) --> e+e- decay with the KLOE detector at DAFNE

Details Search for the K(S) --> e+e- decay with the KLOE detector at DAFNE Search for the K(S) --> e+e- decay with the KLOE detector at DAFNE

2007-07-18

arxiv.org/abs/0707.2687v1

Phys.Lett.B672:203-208,2009

Physics

High Energy Physics

High Energy Physics - Experiment

paper submitted to Lepton Photon 07

Scientific paper

10.1016/j.physletb.2009.01.037

We present results of a direct search for the decay KS --> e+e- with the KLOE detector, obtained with a sample of e+e- --> phi --> KSKL events produced at DAFNE, the Frascati phi-factory, for an integrated luminosity of 1.3fb-1. The Standard Model prediction for this decay is BR(KS --> e+e-) = 1.6*10^-15. The search has been performed tagging the KS decays by simultaneous detection of a KL interaction in the calorimeter. Background rejection has been optimized by using both kinematic cuts and particle identification. At the end of the analysis chain we find BR(KS --> e+e-) < 2.1*10^-8 at 90% CL, which improves by a factor of ~7 on the previous best result, obtained by CPLEAR experiment.

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