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Abstract: We present the result of a direct search for the decay K S -> e+e-, obtainedwith a sample of e+e-> phi -> K S K L events produced at DAFNE, the Frascatiphi-factory, for an integrated luminosity of 1.9 fb^-1.
The search has beenperformed using a pure K S beam tagged by the simultaneous detection of a K Linteraction in the calorimeter.
Background rejection has been optimized byusing both kinematic and particle identification cuts.
We find BRK S -> e+e-< 9x10^-9 at 90% CL, which improves by an order of magnitude on the previousbest limit.



Author: The KLOE Collaboration: F.
Ambrosino, A.
Antonelli, M.
Antonelli, F.
Archilli, P.
Beltrame, G.
Bencivenni, S.
Bertolucci, C.
Bini


Source: https://arxiv.org/



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