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, Cesare
- Bloise, C
- Bocchetta, S
- Bossi, F
- Branchini, P
- Campana, P
- Capon, G
- Capussela, T
- Ceradini, F
- Cesario, F
- Ciambrone, P
- Crucianelli, F
- Conetti, S
- DE LUCIA, E
- DE SANTIS, Antonio
- DE SIMONE, P
- DE ZORZI, Guido
- Denig, A
- DI DOMENICO, Antonio
- DI DONATO, C
- DI MICCO, B
- Dreucci, M
- Felici, G
- Ferrer, Ml
- Fiore, Salvatore
- Franzini, Paolo
- Gatti, C
- Gauzzi, Paolo
- Giovannella, S
- Graziani, E
- Kluge, W
- Kulikov, V
- Lanfranchi, G
- LEE FRANZINI, J
- Leone, D
- Martini, M
- Massarotti, P
- Meola, S
- Miscetti, S
- Moulson, M
- Muller, S
- Murtas, F
- Napolitano, M
- Nguyen, F
- Palutan, M
- Pasqualucci, E
- Passeri, A
- Patera, Vincenzo
- Perfetto, F
- Santangelo, P
- Sciascia, B
- Sciubba, Adalberto
- Sibidanov, A
- Spadaro, T
- Testa, M
- Tortora, L
- Valente, P
- Venanzonic, G
- Versaci, R.
DOIAbstract
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
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