A study of the radiative K L →π ± e ∓ νγ decay and search for direct photon emission with the KLOE detector
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,R. Caloi,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. 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
The European Physical Journal C（2008）
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摘要
We present a measurement of the ratio R=Γ(K 0 e3γ ;E * γ > 30 MeV, θ * γ >20 ° )/Γ(K 0 e3 ) and a first measurement of the direct emission contribution in semileptonic K L decays. The measurement was performed at the DA NE φ factory by selecting φ→K L K S decays with the KLOE detector. We use 328 pb -1 of data, corresponding to about 3.5 million K 0 e3 events and about 9000 K 0 e3γ radiative events. Our result is R=(924±23 stat ±16 syst )×10 -5 for the branching ratio and 〈X〉=-2.3±1.3 stat ±1.4 syst for the effective strength parameter describing direct emission.
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关键词
Monte Carlo,Drift Chamber,Track Candidate,KLOE Collaboration,Inner Bremsstrahlung
