Ja n 20 06 Measurement of the Form-Factor Slopes for the Decay K L → π ± e ∓ ν with the KLOE Detector The KLOE Collaboration

F. Ambrosino,A. Antonelli,M. Antonelli,C. Bacci,P. Beltrame,G. Bencivenni,S. Bertolucci,C. Bini,C. Bloise,V. Bocci,F. Bossi,D. Bowring,P. Branchini,R. Caloi,P. Campana,G. Capon,T. Capussela,F. Ceradini,S. Chi,G. Chiefari,P. Ciambrone,S. Conetti,E. De Lucia,A. De Santis,P. De Simone,G. De Zorzi,S. Dell’Agnello,A. Denig,A. Di Domenico,C. Di Donato,S. Di Falco,B. Di Micco,A. Doria,M. Dreucci,G. Felici,A. Ferrari,M. L. Ferrer,G. Finocchiaro,S. Fiore,C. Forti,P. Franzini,C. Gatti,P. Gauzzi,S. Giovannella,E. Gorini,E. Graziani,M. Incagli,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,L. Pontecorvo,M. Primavera,P. Santangelo,E. Santovetti,G. Saracino,B. Sciascia,A. Sciubba,F. Scuri,I. Sfiligoi,T. Spadaro,M. Testa,L. Tortora,P. Valente,B. Valeriani,G. Venanzoni,S. Veneziano,A. Ventura,R. Versaci,G. Xu

semanticscholar（2008）

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Abstract

We present a measurement of the K-π vector current form-factor parameters for the decay KL → πeν. We use 328 pb of data collected in 2001 and 2002, corresponding to ∼ 2 million Ke3 events. Measurements of semileptonic form factors provide information about the dynamics of the strong interaction and are necessary for evaluation of the phase-space integral Ie K needed to measure the CKM matrix element |Vus| for KL → πeν decays. Our result is λ+ = (28.6 ± 0.5 ± 0.4)10 for a linear fit, and λ+ = (25.5 ± 1.5 ± 1.0)10, λ + = (1.4 ± 0.7 ± 0.4)10 for a quadratic fit. key words: ke3 form factor PACS: 13.20.Eb

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