Measurement of the absolute branching ratio of the K + → π + π 0 ( γ ) decay with the KLOE detector The KLOE Collaboration

F. Ambrosino,A. Antonelli, M. Antonelli, F. Archilli,C. Bacci,P. Beltrame,G. Bencivenni,S. Bertolucci, C. Bini,C. Bloise, S. Bocchetta,F. Bossi,P. Branchini, P. Campana,G. Capon, T. Capussela,F. Ceradini, F. Cesario, S. Chi,G. Chiefari,P. Ciambrone, F. Crucianelli, E. De Lucia,A. De Santis, P. De Simone,G. De Zorzi,A. Denig,A. Di Domenico,C. Di Donato,B. Di Micco,A. Doria,M. Dreucci,G. Felici, A. Ferrari,M. L. Ferrer,S. Fiore,C. Forti, P. Franzini, C. Gatti,P. Gauzzi,S. Giovannella,E. Gorini, E. Graziani,W. Kluge,V. Kulikov,F. Lacava,G. Lanfranchi,J. Lee-Franzini,D. Leone,M. Martemianov,M. Martini,P. Massarotti,W. Mei,S. Meola,S. Miscetti,M. Moulson,S. Müller,F. Murtas,M. Napolitano,F. Nguyen,M. Palutan,E. Pasqualucci,A. Passeri, V. Patera, F. Perfetto, M. Primavera,P. Santangelo, G. Saracino,B. Sciascia, A. Sciubba,A. Sibidanov,T. Spadaro,M. Testa,L. Tortora, P. Valente,G. Venanzoni,R. Versaci,G. Xu

semanticscholar（2008）

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Abstract

We have measured the absolute branching ratio of the K+ → π+π0 (γ) decay, using ∼20 million tagged K+ mesons collected with the KLOE detector at DAΦNE, the Frascati φ–factory. Signal counts are obtained from the fit of the distribution of the momentum of the charged decay particle in the kaon rest frame. The result, inclusive of final-state radiation, is BR(K+ → π+π0 (γ))=0.2065± 0.0005stat ± 0.0008syst.

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