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

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