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Semileptonic B ->pi decays from an Omnes improved nonrelativistic constituent quark model

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Semileptonic B ->pi decays from an Omnes improved nonrelativistic constituent quark model

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dc.contributor.author	Albertus, Conrado
dc.contributor.author	Flynn, Jonathan M.
dc.contributor.author	Hernández Gajate, Eliecer
dc.contributor.author	Nieves Pamplona, Juan Miguel
dc.contributor.author	Verde Velasco, José María
dc.date.accessioned	2014-10-21T07:28:42Z
dc.date.available	2014-10-21T07:28:42Z
dc.date.issued	2005
dc.identifier.citation	Albertus, Conrado Flynn, Jonathan M. Hernández Gajate, Eliecer Nieves Pamplona, Juan Miguel Verde Velasco, José María 2005 Semileptonic B ->pi decays from an Omnes improved nonrelativistic constituent quark model Physical Review D 72 3 033002
dc.identifier.uri	http://hdl.handle.net/10550/39262
dc.description.abstract	The semileptonic B ->pi l(+)nu(l) decay is studied starting from a simple quark model which includes the influence of the B-* pole. To extend the predictions of a nonrelativistic constituent quark model from its region of applicability near q(max)(2)=(m(B)-m(pi))(2) to all q(2) values accessible in the physical decay, we use a novel multiply subtracted Omnes dispersion relation, which considerably diminishes the form-factor dependence on the elastic pi B ->pi B scattering amplitudes at high energies. By comparison to the experimental branching fraction we extract vertical bar V(ub)vertical bar=0.0034 +/- 0.0003(exp)+/- 0.0007(theory). To further test our framework, we also study D ->pi and D -> K decays and find excellent results f(pi)(+)(0)/f(K)(+)(0)=0.80 +/- 0.03, B(D-0->pi(-)e(+)nu(e))/B(D-0-> K(-)e(+)nu(e))=0.079 +/- 0.008. In particular for the D ->pi case, we reproduce, with high accuracy, the three-flavor lattice QCD results recently obtained by the Fermilab-MILC-HPQCD Collaboration. While for the D -> K case, we successfully describe the data for f(+)(q(2))/f(+)(0) recently measured by the FOCUS Collaboration.
dc.language.iso	eng
dc.relation.ispartof	Physical Review D, 2005, vol. 72, num. 3, p. 033002
dc.subject	Física
dc.title	Semileptonic B ->pi decays from an Omnes improved nonrelativistic constituent quark model
dc.type	journal article	es_ES
dc.date.updated	2014-10-21T07:28:42Z
dc.identifier.doi	10.1103/PhysRevD.72.033002
dc.identifier.idgrec	068583
dc.rights.accessRights	open access	es_ES