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Determination of m(s) and vertical bar V-us vertical bar from hadronic tau decays

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Determination of m(s) and vertical bar V-us vertical bar from hadronic tau decays

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dc.contributor.author	Gámiz, Elvira
dc.contributor.author	Jamin, Matthias
dc.contributor.author	Pich Zardoya, Antonio
dc.contributor.author	Prades Hernández, Joaquim
dc.contributor.author	Schwab, Felix
dc.date.accessioned	2015-02-27T08:41:52Z
dc.date.available	2015-02-27T08:41:52Z
dc.date.issued	2003
dc.identifier.citation	Gámiz, Elvira Jamin, Matthias Pich Zardoya, Antonio Prades Hernández, Joaquim Schwab, Felix 2003 Determination of m(s) and vertical bar V-us vertical bar from hadronic tau decays Journal of High Energy Physics 2003 1 060-1 060-21
dc.identifier.uri	http://hdl.handle.net/10550/42482
dc.description.abstract	The mass of the strange quark is determined from SU(3)-breaking effects in the tau 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 tau decays. Nevertheless, the resulting m(s) 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 \V-us\. Imposing the unitarity fit for the CKM matrix, we obtain m(s)(2 GeV) = 117 +/- 17 MeV, whereas for the present Particle Data Group average for \V-us\, we find m(s)(2 GeV) = 103 +/- 17 MeV. On the other hand, using an average of m(s) from other sources as an input, we are able to calculate the quark-mixing matrix element \V-us\, and we demonstrate that if the present measurement of the hadronic decay of the tau into strange particles is improved by a factor of two, the determination of \V-us\ is more precise than the current world average.
dc.language.iso	eng
dc.relation.ispartof	Journal of High Energy Physics, 2003, vol. 2003, num. 1, p. 060-1-060-21
dc.subject	Física
dc.title	Determination of m(s) and vertical bar V-us vertical bar from hadronic tau decays
dc.type	journal article	es_ES
dc.date.updated	2015-02-27T08:41:52Z
dc.identifier.doi	10.1088/1126-6708/2003/01/060
dc.identifier.idgrec	009413
dc.rights.accessRights	open access	es_ES