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Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/96539
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dc.contributor.authorCarrasco, Nuria-
dc.contributor.authorGiménez Álvarez, Marcos-
dc.contributor.authorTarantino, C.-
dc.contributor.authorGiménez Gómez, Vicente-
dc.date.accessioned2014-05-12T12:15:41Z-
dc.date.available2014-05-12T12:15:41Z-
dc.date.issued2014-03-04-
dc.identifier.citationJournal of High Energy Physics 2014: 16 (2014)es_ES
dc.identifier.urihttp://hdl.handle.net/10261/96539-
dc.descriptionCarrasco, Nuria et al.-
dc.description.abstractWe present a lattice QCD computation of the b-quark mass, the B and B s decay constants, the B-mixing bag prameters for the full four-fermion operator basis as well as determinations for ξ and f Bq B(q)i−−−√ extrapolated to the continuum limit and to the physical pion mass. We used N f = 2 twisted mass Wilson fermions at four values of the lattice spacing with pion masses ranging from 280 to 500 MeV. Extrapolation in the heavy quark mass from the charm to the bottom quark region has been carried out on ratios of physical quantities computed at nearby quark masses, exploiting the fact that they have an exactly known infinite mass limit. Our results are m b (m b , MS¯¯¯¯¯ ) = 4.29(12) GeV, f Bs = 228(8) MeV, f B = 189(8) MeV and f Bs /f B = 1.206(24). Moreover with our results for the bag-parameters we find ξ = 1.225(31), B(s)1/B(d)1 = 1.01(2), f Bd Bˆ(d)1−−−√ = 216(10) MeV and 1 f Bs Bˆ(s)1−−−√ = 262(10) MeV. We also computed the bag parameters for the complete basis of the four-fermion operators which are required in beyond the SM theories. By using these results for the bag parameters we are able to provide a refined Unitarity Triangle analysis in the presence of New Physics, improving the bounds coming from B (s) − B¯(s) mixing.es_ES
dc.description.sponsorshipG. H. acknowledges the support by DFG (SFB 1044). We acknowledge computer time made available to us on the Altix system at the HLRN supercomputing service in Berlin under the project “B-physics from lattice QCD simulations”. We acknowledge partial support from ERC Ideas Starting Grant n. 279972 “NPFlavour” and ERC Ideas Advanced Grant n. 267985 “DaMeSyFla”.es_ES
dc.language.isoenges_ES
dc.publisherSpringer Naturees_ES
dc.relation.isversionofPublisher's versiones_ES
dc.rightsopenAccesses_ES
dc.titleB-physics from Nf = 2 tmQCD: the Standard Model and beyondes_ES
dc.typeartículoes_ES
dc.identifier.doi10.1007/JHEP03(2014)016-
dc.description.peerreviewedPeer reviewedes_ES
dc.relation.publisherversionhttp://dx.doi.org/10.1007/JHEP03(2014)016es_ES
dc.identifier.e-issn1029-8479-
dc.rights.licensehttp://creativecommons.org/licenses/by/4.0/es_ES
dc.contributor.funderSCOAP-
dc.type.coarhttp://purl.org/coar/resource_type/c_6501es_ES
item.openairetypeartículo-
item.grantfulltextopen-
item.cerifentitytypePublications-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.fulltextWith Fulltext-
item.languageiso639-1en-
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