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

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

2008-11-06

arxiv.org/abs/0811.1007v3

Phys.Lett.B672:203,2009

Physics

High Energy Physics

High Energy Physics - Experiment

13 pages, 11 figures, submitted to Physics Letters B

Scientific paper

10.1016/j.physletb.2009.01.037

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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