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dc.contributor.authorGámiz, Elvira-
dc.contributor.authorPrades, Joaquim-
dc.contributor.authorJamin, Matthias-
dc.contributor.authorSchwab, Félix-
dc.contributor.authorPich, Antonio-
dc.identifier.citationJournal of High Energy Physics (1): 060 (2003)es_ES
dc.description21 páginas, 1 figura, 6 tablas.-- arXiv:hep-ph/0212230v1es_ES
dc.description.abstractThe mass of the strange quark is determined from SU(3)-breaking effects in the τ hadronic width. Compared to previous analyses, the contributions from scalar and pseudoscalar spectral functions, which suffer from large perturbative corrections, are replaced by phenomenological parametrisations. This leads to a sizeable reduction of the uncertainties in the strange mass from τ decays. Nevertheless, the resulting ms value is still rather sensitive to the moment of the invariant mass distribution which is used for the determination, as well as the size of the quark-mixing matrix element |Vus|. Imposing the unitarity fit for the CKM matrix, we obtain ms(2 GeV) = 117 ± 17 MeV, whereas for the present Particle Data Group average for |Vus|, we find ms(2 GeV) = 103 ± 17 MeV. On the other hand, using an average of ms from other sources as an input, we are able to calculate the quark-mixing matrix element |Vus|, and we demonstrate that if the present measurement of the hadronic decay of the τ into strange particles is improved by a factor of two, the determination of |Vus| is more precise than the current world average.es_ES
dc.description.sponsorshipE.G. is indebted to MECD (Spain) for a F.P.U. Fellowship. This work has been supported in part by the European Union RTN Network EURIDICE Grant No. HPRN-CT2002- 00311 (E.G., A.P. and J.P.), by MCYT (Spain) Grants No. FPA2000-1558 (E.G. and J.P.), and FPA-2001-3031 (A.P. and M.J.), by GVA Grant No. CTIDIB/2002/24 (A.P.) and by Junta de Andalucía Grant No. FQM-101 (E.G. and J.P.). M.J. would also like to thank the Deutsche Forschungsgemeinschaft for support.es_ES
dc.publisherInstitute of Physics Publishinges_ES
dc.subjectQuark masses and SM parameterses_ES
dc.subjectSum ruleses_ES
dc.titleDetermination of ms and |Vus| from hadronic τ decayses_ES
dc.description.peerreviewedPeer reviewedes_ES
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