Flavio Archilli, for KLOE Collaboration
Published 2008-05-15, updated 2008-08-27Version 3
We present results of a direct search for the decay K_S->e+e- with the KLOE detector, obtained with a sample of e+e- -> phi -> K_S K_L events produced at DAFNE, the Frascati phi-factory, for an integrated luminosity of 1.9 fb-1. The Standard Model prediction for this decay is BR(K_S->e+e-) = 2 x 10^-14. The search has been performed by tagging the K_S decays with simultaneous detection of a K_L 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(K_S->e+e-) < 9.3 x 10^-9 at 90% CL, which improves by a factor of ~15 on the previous best result, obtained by CPLEAR experiment.
Comments: 4 pages, 4 figures, to appear in the proceedings of 43rd Rencontres de Moriond EW, La Thuile, Italy, 1-8 March 2008
A direct search for the CP-violating decay Ks->3p^0 with the KLOE detector at DAFNE
Search for the K(S) --> e+e- decay with the KLOE detector at DAFNE
Measurement of the ratio Gamma(K_L -> gamma gamma)/Gamma(K_L -> pi^0 pi^0 pi^0) with the KLOE detector
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