We present results of a direct search for the decay KS → e +e- with the KLOE de- tector, obtained with a sample of e+e- → φ → KSKL events produced at DAPdblNE, the Frascati φ-factory, for an integrated luminosity of 1.3 fb-1. The StandardModel prediction for this decay is BR(KS → e+e -) = 1.6 × 10-15. The search has been performed tagging the KS decays by simultaneous detection of a KL interaction in the calorimeter. Background rejection has been optimized by using both kine- matic cuts and particle identification. At the end of the analysis chain we find BR(KS → e+e-) < 2.1 × 10-8 at 90% CL, which improves by a factor of ∼ 7 on the previous best result, obtained by CPLEAR experiment.

Search for the KS-->e+e- decay with the KLOE detector at DAPHNE

AMBROSINO, FABIO;CAPUSSELA, TIZIANA;MASSAROTTI, PAOLO;SARACINO, GIULIO;
2007

Abstract

We present results of a direct search for the decay KS → e +e- with the KLOE de- tector, obtained with a sample of e+e- → φ → KSKL events produced at DAPdblNE, the Frascati φ-factory, for an integrated luminosity of 1.3 fb-1. The StandardModel prediction for this decay is BR(KS → e+e -) = 1.6 × 10-15. The search has been performed tagging the KS decays by simultaneous detection of a KL interaction in the calorimeter. Background rejection has been optimized by using both kine- matic cuts and particle identification. At the end of the analysis chain we find BR(KS → e+e-) < 2.1 × 10-8 at 90% CL, which improves by a factor of ∼ 7 on the previous best result, obtained by CPLEAR experiment.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11588/597908
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