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Aloisio, A; Antonelli, M; Bacci, C; Baldini-Ferroli, R; Bencivenni, G; Bertolucci, S; Bini, C; Bloise, C; Bossi, F; Branchini, P; Bulychjov, S.A; Cabibbo, G; Campana, P; Capon, G; Carboni, G; Casarsa, M; Cataldi, G; Ceradini, F; Cervelli, F; Cevenini, F; Chiefari, G; Ciambrone, P; Conetti, S; De Lucia, E; De Robertis, G; De Simone, P; De Zorzi, G; Dell'Agnello, S; Denig, A; Di Domenico, A; Di Donato, C; Di Falco, S; Doria, A; Dreucci, M; Erriquez, O; Farilla, A; Felici, G; Ferrari, A; Ferrer, M.L; Forti, C; Franceschi, A; Franzini, P; Gatti, C; Gauzzi, P; Giovannella, S; Gorini, E; Grancagnolo, F; Graziani, E; Incagli, M; Ingrosso, L; Kluge, W; Kuo, C; Kulikov, V; Lacava, F; Lanfranchi, G; Lee-Franzini, J; Leone, D; Lu, F; Martemianov, M; Matsyuk, M; Mei, W; Merola, L; Messi, R; Miscetti, S; Moulson, M; Müller, S; Murtas, F; Napolitano, M; Nedosekin, A; Nguyen, F; Palutan, M; Pasqualucci, E; Passalacqua, L; Passeri, A; Patera, V; Petrolo, E; Pirozzi, G; Pontecorvo, L; Primavera, M; Ruggieri, F; Santangelo, P; Santovetti, E; Saracino, G; Schamberger, R.D; Sciascia, B; Sciubba, A; Scuri, F; Sfiligoi, I; Spadaro, T; Spiriti, E; Tong, G.L; Tortora, L; Valente, E; Valente, P; Valeriani, B; Venanzoni, G; Veneziano, S; Ventura, A; Xu, Y; Yu, Y
Physics letters. B, 06/2002, Volume: 538, Issue: 1Journal Article
We have measured the ratio R S π = Γ( K S → π + π −( γ))/ Γ( K S → π 0 π 0) with the KLOE detector at the DA ΦNE e + e − collider. This measurement is fully inclusive with respect to the π + π − γ final state. The sample of over 10 6 two-pion decays of tagged K S mesons allows a statistical error as low as ∼0.1% to be obtained. The accuracy is limited by systematic uncertainties, which are estimated primarily from data. We find R S π =2.236±0.003 stat±0.015 syst.
