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Search for the K_S -> e+e- decay with the KLOE detector · Around

2008

Search for the K_S -> e+e- decay with the KLOE detector

The KLOE Collaboration, Ambrosino, F., Antonelli, A. et al.

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We present the result of a direct search for the decay K_S -> e+e-, 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 search has been performed using a pure K_S beam tagged by the simultaneous detection of a K_L interaction in the calorimeter.
Background rejection has been optimized by using both kinematic and particle identification cuts.
We find BR(K_S -> e+e-) < 9x10^-9 at 90% CL, which improves by an order of magnitude on the previous best limit.

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