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Combined nonrelativistic constituent quark model and heavy quark effective theory study of semileptonic decays of Lambda(b) and Xi(b) baryons

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Combined nonrelativistic constituent quark model and heavy quark effective theory study of semileptonic decays of Lambda(b) and Xi(b) baryons

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dc.contributor.author Albertus, Conrado
dc.contributor.author Hernández Gajate, Eliecer
dc.contributor.author Nieves Pamplona, Juan Miguel
dc.date.accessioned 2014-10-21T07:42:57Z
dc.date.available 2014-10-21T07:42:57Z
dc.date.issued 2005
dc.identifier.citation Albertus, Conrado Hernández Gajate, Eliecer Nieves Pamplona, Juan Miguel 2005 Combined nonrelativistic constituent quark model and heavy quark effective theory study of semileptonic decays of Lambda(b) and Xi(b) baryons Physical Review D 71 1 014012
dc.identifier.uri http://hdl.handle.net/10550/39266
dc.description.abstract We present the results of a nonrelativistic constituent quark model study of the semileptonic decays Lambda(b)(0)-->Lambda(c)(+)l(-)(ν) over bar (l) and Xi(b)(0)-->Xi(c)(+)l(-)(ν) over bar (l) (l=e,mu). We work on coordinate space, with baryon wave functions recently obtained from a variational approach based on heavy quark symmetry. We develop a novel expansion of the electroweak current operator, which supplemented with heavy quark effective theory constraints, allows us to predict the baryon form factors and the decay distributions for all q(2) (or equivalently w) values accessible in the physical decays. Our results for the partially integrated longitudinal and transverse decay widths, in the vicinity of the w=1 point, are in excellent agreement with lattice calculations. Comparison of our integrated Lambda(b)-decay width to experiment allows us to extract the V-cb Cabbibo-Kobayashi-Maskawa matrix element for which we obtain a value of \V-cb\=0.040+/-0.005(stat)(-0.002)(+0.001)(theory) also in excellent agreement with a recent determination by the DELPHI Collaboration from the exclusive (B) over bar (0)(d)-->D(*+)l(-)(ν) over bar (l) decay. Besides for the Lambda(b)(Xi(b))-decay, the longitudinal and transverse asymmetries and the longitudinal to transverse decay ratio are <a(L)>=-0.954+/-0.001(-0.945+/-0.002), <a(T)>=-0.665+/-0.002(-0.628+/-0.004), and R-L/T=1.63+/-0.02(1.53+/-0.04), respectively.
dc.language.iso eng
dc.relation.ispartof Physical Review D, 2005, vol. 71, num. 1, p. 014012
dc.subject Física
dc.title Combined nonrelativistic constituent quark model and heavy quark effective theory study of semileptonic decays of Lambda(b) and Xi(b) baryons
dc.type journal article es_ES
dc.date.updated 2014-10-21T07:42:57Z
dc.identifier.doi 10.1103/PhysRevD.71.014012
dc.identifier.idgrec 068586
dc.rights.accessRights open access es_ES

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