Measurement of the Branching Ratio of the decay KL->π±e-+ν and extraction of the CKM parameter |Vus|
A. Lai; D. Marras; A. Bevan; R. S. Dosanjh; T. J. Gershon; B. Hay; G. E. Kalmus; C. Lazzeroni; D. J. Munday; E. Olaiya; M. A. Parker; T. O. White; S. A. Wotton; G. Barr; G. Bocquet; A. Ceccucci; T. Cuhadar Donszelmann; D. Cundy; G. D'Agostini; N. Doble; V. Falaleev; L. Gatignon; A. Gonidec; B. Gorini; G. Govi; P. Grafstrom; W. Kubischta; A. Lacourt; A. Norton; S. Palestini; B. Panzer Steindel; H. Taureg; M. Velasco; H. Wahl; C. Cheshkov; A. Gaponenko; P. Hristov; V. Kekelidze; L. Litov; D. Madigojine; N. Molokanova; Y. Potrebenikov; S. Stoynev; G. Tatishvili; A. Tkatchev; A. Zinchenko; I. Knowles; V. Martin; R. Sacco; A. Walker; CONTALBRIGO, Marco; DALPIAZ, Pietro; J. Duclos; P. L. Frabetti; GIANOLI, Alberto; MARTINI, Mara; PETRUCCI, Ferruccio Carlo; SAVRIE', Mauro; A. Bizzeti; M. Calvetti; G. Collazuol; G. Graziani; E. Iacopini; M. Lenti; F. Martelli; M. Veltri; H. G. Becker; K. Eppard; M. Eppard; H. Fox; A. Kalter; K. Kleinknecht; U. Koch; L. Kopke; P. L. da Silva; P. Marouelli; I. Pellmann; A. Peters; B. Renk; S. A. Schmidt; V. Schonharting; Y. Schue; R. Wanke; A. Winhart; M. Wittgen; J. C. Chollet; L. Fayard; L. Iconomidou Fayard; J. Ocariz; G. Unal; I. Wingerter Seez; G. Anzivino; P. Cenci; E. Imbergamo; P. Lubrano; A. Mestvirishvili; A. Nappi; M. Pepe; M. Piccini; R. Casali; C. Cerri; M. Cirilli; F. Costantini; R. Fantechi; L. Fiorini; S. Giudici; G. Lamanna; I. Mannelli; G. Pierazzini; M. Sozzi; J. B. Cheze; J. Cogan; M. D. Beer; P. Debu; A. Formica; R. G. de Cassagnac; E. Mazzucato; B. Peyaud; R. Turlay; B. Vallage; M. Holder; A. Maier; M. Ziolkowski; R. Arcidiacono; C. Biino; N. Cartiglia; R. Guida; F. Marchetto; E. Menichetti; N. Pastrone; J. Nassalski; E. Rondio; M. Szleper; W. Wislicki; S. Wronka; H. Dibon; G. Fischer; M. Jeitler; M. Markytan; I. Mikulec; G. Neuhofer; M. Pernicka; A. Taurok; L. Widhalm;
Measurement of the Branching Ratio of the decay KL->π±e-+ν and extraction of the CKM parameter |Vus|
We present a new measurement of the branching ratio R of the decay KL→πeν, denoted as Ke3, relative to all charged KL decays with two tracks, based on data taken with the NA48 detector at the CERN SPS. We measure R = 0.4978 ±0.0035. From this we derive the Ke3 branching fraction and the weak coupling parameter |Vus | in the CKM matrix. We obtain |Vus | f+(0) = 0.2146 ±0.0016, where f+(0) is the vector form factor in the Ke3 decay.
Italy
- University of Modena and Reggio Emilia Italy
- University of Ferrara Italy
- University of Urbino Italy
mesoni K; decadimenti; matrice CKM, CKM CP violation
mesoni K; decadimenti; matrice CKM, CKM CP violation
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