Search for the K_S -> e+e- decay with the KLOE detector
The KLOE Collaboration: F. Ambrosino, A. Antonelli, M. Antonelli, F., Archilli, P. Beltrame, G. Bencivenni, S. Bertolucci, C. Bini, C. Bloise, S., Bocchetta, F. Bossi, P. Branchini, P. Campana, G. Capon, D. Capriotti, T., Capussela, F. Ceradini, P. Ciambrone, F. Crucianelli
TL;DR
This paper reports a highly sensitive search for the rare decay K_S -> e+e- using the KLOE detector, setting a new upper limit that significantly improves previous constraints.
Contribution
The study provides the first direct search for K_S -> e+e- at the DAFNE collider, establishing a new upper limit on its branching ratio.
Findings
BR(K_S -> e+e-) < 9x10^-9 at 90% CL
Improved the previous limit by an order of magnitude
Demonstrated effective background rejection techniques
Abstract
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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