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

We present the result of a direct search for the decay K-S -> e(+)e(-), obtained with a sample of e(+)e(-) -> phi -> KSKL events produced at DA phi NE, 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(KS -> e(+)e(-)) < 9 x 10(-9) at 90% CL, which improves by an order of magnitude on the previous best limit, (C) 2009 Elsevier B.V, All rights reserved.