A Study of the radiative KL → π±e ±ν(γ) decay and possible osservation of direct photon emission with the KLOE detector

Fabio Ambrosino,Angelo Antonelli,Mario Antonelli,Flavio Archilli,Cesare Bacci,Paolo Beltrame,Giorgio Bencivenni,Sergio Bertolucci,Cesare Bini,Caterina Bloise,Simona Serena Bocchetta,Valerio Bocci,Fabio C. Bossi,Paolo Branchini,R. M. Caloi,Pierluigi L. Campana,G. Capon,Tiziana Capussela,Filippo Ceradini,S. Chi,G. V. Chiefari,Paolo Ciambrone,Erika De Lucia,Antonio De Santis,Patrizia De Simone,G. De Zorzi,A. Denig,Antonio Di Domenico,C. Di Donato,St D. Di Falco,Biagio D. Di Micco,Alessandra Doria,Marco Dreucci,Giuseppe Felici,Anna Maria Ferrari,Maria Lorenza Ferrer,G. Finocchiaro,S. Fiore,C. Forti,Paolo Franzini,Claudio Gatti,P. Gauzzi,Simona Giovannella,Edoardo Gorini,Enrico Graziani,Marco Incagli,Wolfgang Kluge,Vladimir V. Kulikov,Francesco Lacava,Gaia Lanfranchi,Juliet Lee-Franzini,Debora Leone,Manuele Martini,Paolo Massarotti,W. Mei,Sabino Meola,Stefano Miscetti,Matthew Moulson,Stefan E. Müller,F. Murtas,M. Napolitano,Federico Nguyen,Matteo Palutan,Enrico Pasqualucci,Antonio Passeri,Vincenzo Patera,F. Perfetto,Margherita Primavera,P. Santangelo,Giulio Saracino,Barbara Sciascia,A. Sciubba,Fabrizio Scuri,Igor Sfiligoi,Alexei L. Sibidanov,Tommaso Spadaro,M. Testa,L. Tortora,Paolo Valente,Barbara Valeriani,Graziano Venanzoni,Roberto Versaci,Guofa Xu

23rd International Symposium on Lepton-Photon Interactions at High Energy, LP 2007（2007）

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摘要

We present the measurement of the ratio R =r(K0 e3γ;e *30MeV,θ* 20) F (K0 e3(γ))and a first measurement of the direct emission contribution for the same process. We use 328 pb-1 of data collected at KLOE in 2001 and 2002, corresponding to about 3 million of K0 e3(γ) events and about 9 thousand K0 e3γ radiative events. Our result is R= (924± 23stat±16syst)×10-5 for the branching ratio and hXi = -2.3±1.3stat±1.4syst for the parameter describing direct emission. key words: direct emission.

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