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V-us determination from hyperon semileptonic decays

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dc.contributor.author	Mateu Barreda, Vicent
dc.contributor.author	Pich Zardoya, Antonio
dc.date.accessioned	2015-02-27T10:18:54Z
dc.date.available	2015-02-27T10:18:54Z
dc.date.issued	2005
dc.identifier.uri	http://hdl.handle.net/10550/42492
dc.description.abstract	We analyze the numerical determination of the quark mixing factor V-us from hyperon semileptonic decays. The discrepancies between the results obtained in two previous studies are clarified. Our fits indicate sizeable SU(3) breaking corrections, which unfortunately can only be fully determined from the data at the first order. The lack of a reliable theoretical calculation of second-order symmetry breaking effects translates into a large systematic uncertainty, which has not been taken into account previously. Our final result, vertical bar V(us)vertical bar = 0.226 +/- 0.005, is not competitive with the existing determinations from K-l3, K-l2 and tau decays.
dc.language.iso	eng
dc.relation.ispartof	Journal of High Energy Physics, 2005, vol. 2005, num. 10, p. 041-1-041-15
dc.source	Mateu Barreda, Vicent Pich Zardoya, Antonio 2005 V-us determination from hyperon semileptonic decays Journal of High Energy Physics 2005 10 041-1 041-15
dc.subject	Física
dc.title	V-us determination from hyperon semileptonic decays
dc.type	journal article	es_ES
dc.date.updated	2015-02-27T10:18:55Z
dc.identifier.doi	http://dx.doi.org/10.1088/1126-6708/2005/10/041
dc.identifier.idgrec	025690
dc.rights.accessRights	open access	es_ES