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Octet-baryon axial-vector charges and SU(3)-breaking effects in the semileptonic hyperon decays

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Octet-baryon axial-vector charges and SU(3)-breaking effects in the semileptonic hyperon decays

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dc.contributor.author Ledwig, T.
dc.contributor.author Martín Camalich, Jorge
dc.contributor.author Geng, Li Sheng
dc.contributor.author Vicente Vacas, Manuel José
dc.date.accessioned 2016-04-21T11:49:43Z
dc.date.available 2016-04-21T11:49:43Z
dc.date.issued 2014
dc.identifier.citation Ledwig, T. Martín Camalich, Jorge Geng, Li Sheng Vicente Vacas, Manuel José 2014 Octet-baryon axial-vector charges and SU(3)-breaking effects in the semileptonic hyperon decays Physical Review D 90 5 054502
dc.identifier.uri http://hdl.handle.net/10550/52968
dc.description.abstract The octet-baryon axial-vector charges and the g(1)/f(1) ratios measured in the semileptonic hyperon decays are studied up to O(p(3)) using the covariant baryon chiral perturbation theory with explicit decuplet contributions. We clarify the role of different low-energy constants and find a good convergence for the chiral expansion of the axial-vector charges of the baryon octet, g(1)(0), with O(p(3)) corrections typically around 20% of the leading ones. This is a consequence of strong cancellations between different next-to-leading- order terms. We show that considering only nonanalytic terms is not enough and that analytic terms appearing at the same chiral order play an important role in this description. The same effects still hold for the chiral extrapolation of the axial-vector charges and result in a rather mild quark-mass dependence. As a result, we report a determination of the leading-order chiral couplings, D = 0.623(61)(17) and F = 0.441(47)(2), as obtained from a completely consistent chiral analysis up to O(p(3)). Furthermore, we note that the appearance of an unknown low-energy constant precludes the extraction of the proton octet charge from semileptonic decay data alone, which is relevant for an analysis of the composition of the proton spin.
dc.language.iso eng
dc.relation.ispartof Physical Review D, 2014, vol. 90, num. 5, p. 054502
dc.subject Física
dc.title Octet-baryon axial-vector charges and SU(3)-breaking effects in the semileptonic hyperon decays
dc.type journal article es_ES
dc.date.updated 2016-04-21T11:49:43Z
dc.identifier.doi 10.1103/PhysRevD.90.054502
dc.identifier.idgrec 105873
dc.rights.accessRights open access es_ES

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