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Measurement of the form-factor slopes for the decay K-L -> pi(+/-)e(+/-)nu with the KLOE detector

By Ambrosino F, Antonelli A, Antonelli M, Bacci C, Beltrame P, Bencivenni G, Bertolucci S, Bini C, Bloise C, Bocci V, Bossi F, Bowring D, Branchini P, Caloi R, Campana P, Capon G, Capussela T, Ceradini F, Chi S, Chiefari G, Ciambrone P, Conetti S, De Lucia E, De Santis A, De Simone P, De Zorzi G, Dell&apos, Denig A, Di Domenico A, Di Donato C, Di Falco S, Di Micco B, Doria A, Dreucci M, Felici G, Ferrari A, Ferrer ML, Finocchiaro G, Fiore S, Forti C, Franzini P, Gatti C, Gauzzi P, Giovannella S, Gorini E, Graziani E, Incagli M, Kluge W, Kulikov V, Lacava F, Lanfranchi G, Lee-Franzini J, Leone D, Martini M, Massarotti P, Mei W, Meola S, Miscetti S, Moulson M, Muller S, Murtas F, Napolitano M, Nguyen F, Palutan M, Pasqualucci E, Passeri A, Patera V, Perfetto F, Pontecorvo L, Primavera M, Santangelo P, Santovetti E, Saracino G, Sciascia B, Sciubba A, Scuri F, Sfiligoi I, Spadaro T, Testa M, Tortora L, Valente P, Valeriani B, Venanzoni G, Veneziano S, Ventura A, Versaci R and Xu G

Abstract

We present a measurement of the K-pi vector current form-factor parameters for the decay K-L -> pi(+/-)e(-/+)nu. We use 328 pb(-1) of data collected in 2001 and 2002, corresponding to similar to 2 million K-e3 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 I-K(e) needed to measure the CKM matrix element |V-us| for K-L -> pi(+/-)e(-/+)nu decays. Our result is lambda(+) = (28.6 +/- 0.5 +/- 0.4) x 10(-3) for a linear fit, and lambda'(+) = (25.5 +/- 1.5 +/- 1.0) x 10(-3), (1.4 +/- 0.7 +/- 0.4) x 10(-3) for a quadratic fit. (c) 2006 Elsevier B.V. All rights reserved

Publisher: 'Elsevier BV'
Year: 2006
DOI identifier: 10.1016/j.physletb.2006.03.036
OAI identifier: oai:air.uniud.it:11390/861069
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