We have searched for the decay KS → γγ in a sample of ∼ 2×109 φ → KSKL decays collected at DANE with an integrated luminosity of 1.9 fb−1. KS are tagged by the KL interaction in the calorimeter. Two prompt photons must also be detected. Kinematic constraints reduce the initial 6×105 events to 2740 candidates, from which a signal of 711 ± 35 events is extracted. By normalizing to the KS → 2π0 decays counted in the same sample, we measure BR(KS → γγ) = (2.26±0.12stat ±0.06syst)×10−6, in agreement with O(p4) Chiral Perturbation Theory predictions.

Measurement of the K-S -> gamma gamma branching ratio using a pure K-S beam with the KLOE detector / Ambrosino, F., Antonelli, A., Antonelli, M., Archilli, F., Beltrame, P., Bencivenni, G., Bertolucci, S., Bini, C., Bloise, C., Bocchetta, S., Bossi, F., Branchini, P., Campana, P., Capon, G., Capussela, T., Ceradini, F., Cesario, F., Ciambrone, P., Crucianelli, F., Conetti, S., et al.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1126-6708. - (2008). [10.1088/1126-6708/2008/05/051]

Measurement of the K-S -> gamma gamma branching ratio using a pure K-S beam with the KLOE detector

BINI, Cesare;DE SANTIS, ANTONIO;DE ZORZI, Guido;DI DOMENICO, Antonio;FIORE, SALVATORE;FRANZINI, Paolo;GAUZZI, Paolo;PATERA, Vincenzo;SCIUBBA, Adalberto;
2008

Abstract

We have searched for the decay KS → γγ in a sample of ∼ 2×109 φ → KSKL decays collected at DANE with an integrated luminosity of 1.9 fb−1. KS are tagged by the KL interaction in the calorimeter. Two prompt photons must also be detected. Kinematic constraints reduce the initial 6×105 events to 2740 candidates, from which a signal of 711 ± 35 events is extracted. By normalizing to the KS → 2π0 decays counted in the same sample, we measure BR(KS → γγ) = (2.26±0.12stat ±0.06syst)×10−6, in agreement with O(p4) Chiral Perturbation Theory predictions.
2008
01 Pubblicazione su rivista::01a Articolo in rivista
Measurement of the K-S -> gamma gamma branching ratio using a pure K-S beam with the KLOE detector / Ambrosino, F., Antonelli, A., Antonelli, M., Archilli, F., Beltrame, P., Bencivenni, G., Bertolucci, S., Bini, C., Bloise, C., Bocchetta, S., Bossi, F., Branchini, P., Campana, P., Capon, G., Capussela, T., Ceradini, F., Cesario, F., Ciambrone, P., Crucianelli, F., Conetti, S., et al.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1126-6708. - (2008). [10.1088/1126-6708/2008/05/051]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/228000
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