Improving the Kpi vector form factor through Kl3 constraints
Boito, Diogo (Universitat Autònoma de Barcelona. Departament de Física)
Escribano, Rafel (Universitat Autònoma de Barcelona. Departament de Física)
Jamin, Matthias (Institut de Física d'Altes Energies)

Date:	2011
Abstract:	The Kπ vector form factor, FKπ+, used to reproduce the Belle spectrum of τ→Kπντ decays is described by means of a three-times subtracted dispersion relation also incorporating constraints from Kl3 decays. The slope and curvature of FKπ+ are fitted to the data yielding λ'+ = (25. 49±0. 31)×10−3 and λ''+ = (12. 22±0. 14)×10−4. The pole parameters of the K*(892)± are found to be mK* (892)± = 892. 0±0. 5 MeV and ΓK*(892)± = 46. 5±1. 1 MeV. The phase-space integrals relevant for Kl3 analyses and the P-wave isospin-1/2 Kπ phase-shift threshold parameters are also calculated.
Grants:	Ministerio de Ciencia e Innovación FPA2008-01430 Agència de Gestió d'Ajuts Universitaris i de Recerca 2009/SGR-00894
Note:	Altres ajuts: this work has been supported in part under the EU Contract No. MRTN-CT-2006-035482 "FLAVIAnet"
Note:	Talk presented by R. Escribano at the IX International Conference on Quark Confinement and Hadron Spectrum (QCHS09), Madrid, Spain, 30.8-3.9.2010
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Subject:	π decays ; K decays ; Dispersion relations
Published in:	AIP Conference Proceegings, Vol. 1343, issue 1 (May 2011), p. 271-273, ISSN 1551-7616

Adreça alternativa: https://arxiv.org/abs/1012.3493v1
DOI: 10.1063/1.3574999

Postprint 4 p, 235.9 KB

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