We present the result of a direct search for the decay KS →e+e−, obtained with a sample of e+e− → φ → KS KL events produced at DANE, the Frascati φ-factory, for an integrated luminosity of 1.9 fb−1. The search has been performed using a pure KS beam tagged by the simultaneous detection of a KL interaction in the calorimeter. Background rejection has been optimized by using both kinematic and particle identification cuts. We find BR(KS →e+e− ) < 9 × 10−9 at 90% CL, which improves by an order of magnitude on the previous best limit.
Search for the Ks -> e+ e- decay with the KLOE detector / Bini, C; Gauzzi, Paolo; Kloe, Collaboration; Bini, Cesare; DE SANTIS, Antonio; DI DOMENICO, Antonio; Fiore, Salvatore; Franzini, Paolo; Patera, Vincenzo; Perfetto, Francesco; Sciubba, Adalberto. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 672:(2009), pp. 203-208. [10.1016/j.physletb.2009.01.037]
Search for the Ks -> e+ e- decay with the KLOE detector
BINI C;GAUZZI, Paolo;BINI, Cesare;DE SANTIS, ANTONIO;DI DOMENICO, Antonio;FIORE, SALVATORE;FRANZINI, Paolo;PATERA, Vincenzo;PERFETTO, FRANCESCO;SCIUBBA, Adalberto
2009
Abstract
We present the result of a direct search for the decay KS →e+e−, obtained with a sample of e+e− → φ → KS KL events produced at DANE, the Frascati φ-factory, for an integrated luminosity of 1.9 fb−1. The search has been performed using a pure KS beam tagged by the simultaneous detection of a KL interaction in the calorimeter. Background rejection has been optimized by using both kinematic and particle identification cuts. We find BR(KS →e+e− ) < 9 × 10−9 at 90% CL, which improves by an order of magnitude on the previous best limit.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
