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Murtas, F. Nguyen, F. Perfetto, G. Bencivenni, G. Capon, G. Chiefari, G. De Zorzi, G. Felici, G. Lanfranchi, G. Saracino, G. Venanzoni, G. Xu, J. Lee-Franzini, L. Tortora, M. Antonelli, M. Dreucci, M. L. Ferrer, M. Martemianov, M. Martini, M. Moulson, M. Napolitano, M. Palutan, M. Primavera, M. Testa, P. Beltrame, P.Branchini, P. Campana, P. Ciambrone, P. De Simone, P. Franzini, P. Gauzzi, P. Massarotti, P. Santangelo, P. Valente, R. Versaci, S. Bertolucci, S. Bocchetta, S. Chi, S. Fiore, S. Giovannella, S. Meola, S. Miscetti, S. M\\\"uller, T. Capussela, T. Spadaro, V. Kulikov, V. Patera, W. Kluge, W. Mei","submitted_at":"2008-04-29T10:48:44Z","abstract_excerpt":"We have measured the absolute branching ratio of the K+ -> pi+ pi0 (gamma) decay, using about 20 million tagged K+ mesons collected with the KLOE detector at DAFNE, the Frascati phi-factory. Signal counts are obtained from the fit of the distribution of the momentum of the charged decay particle in the kaon rest frame. 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Antonelli, A. Denig, A. De Santis, A. Di Domenico, A. Doria, A. Ferrari, A. Passeri, A. Sciubba, A. Sibidanov, B. Di Micco, B. Sciascia, C. Bacci, C. Bini, C. Bloise, C. Di Donato, C. Forti, C. Gatti, D. Leone, E. De Lucia, E. Gorini, E. Graziani, E. Pasqualucci, F. Ambrosino, F. Archilli, F. Bossi, F. Ceradini, F. Cesario, F. Crucianelli, F. Lacava, F. Murtas, F. Nguyen, F. Perfetto, G. Bencivenni, G. Capon, G. Chiefari, G. De Zorzi, G. Felici, G. Lanfranchi, G. Saracino, G. Venanzoni, G. Xu, J. Lee-Franzini, L. Tortora, M. Antonelli, M. Dreucci, M. L. Ferrer, M. Martemianov, M. Martini, M. Moulson, M. Napolitano, M. Palutan, M. Primavera, M. Testa, P. Beltrame, P.Branchini, P. Campana, P. Ciambrone, P. De Simone, P. Franzini, P. Gauzzi, P. Massarotti, P. Santangelo, P. Valente, R. Versaci, S. Bertolucci, S. Bocchetta, S. Chi, S. Fiore, S. Giovannella, S. Meola, S. Miscetti, S. M\\\"uller, T. Capussela, T. Spadaro, V. Kulikov, V. Patera, W. Kluge, W. 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