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(B)over-bar(s) -> K semileptonic decay from an Omnes improved constituent quark model

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(B)over-bar(s) -> K semileptonic decay from an Omnes improved constituent quark model

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dc.contributor.author Albertus, Conrado
dc.contributor.author Hernández Gajate, Eliecer
dc.contributor.author Hidalgo Duque, Carlos
dc.contributor.author Nieves Pamplona, Juan Miguel
dc.date.accessioned 2016-04-21T11:59:06Z
dc.date.available 2016-04-21T11:59:06Z
dc.date.issued 2014
dc.identifier.citation Albertus, Conrado Hernández Gajate, Eliecer Hidalgo Duque, Carlos Nieves Pamplona, Juan Miguel 2014 (B)over-bar(s) -> K semileptonic decay from an Omnes improved constituent quark model Physics Letters B 738 144 149
dc.identifier.uri http://hdl.handle.net/10550/52970
dc.description.abstract We study the f(+) form factor for the semileptonic (B) over bar (s) -> K+ l(-) (V) over bar (l) decay in a constituent quark model. The valence quark estimate is supplemented with the contribution from the (B) over bar* pole that dominates the high q(2) region. We use a multiply-subtracted Omnes dispersion relation to extend the quark model predictions from its region of applicability near q(max)(2) = (M-Bs ¿ M-K)(2) similar to 23.75 GeV2 to all q(2) values accessible in the physical decay. To better constrain the dependence of f(+) on q(2), we fit the subtraction constants to a combined input from previous light cone sum rule by Duplancic and Melic (2008) [11] and the present quark model results. From this analysis, we obtain Gamma ( (B) over bar (s) -> K+ l(-) (V) over bar (l)) = (5.47(-0.46)(+0.54)) vertical bar Vub vertical bar(2) x 10(-9) MeV, which is about 10% and 20% higher than the predictions based on Lattice QCD and QCD light cone sum rules respectively. The former predictions, for both the form factor f(+) (q(2)) and the differential decay width, lie within the 1 sigma band of our estimated uncertainties for all q(2) values accessible in the physical decay, except for a quite small region very close to q(max)(2). Differences with the light cone sum results for the form factor f(+) are larger than 20% in the region above q(2) = 15 GeV2.
dc.language.iso eng
dc.relation.ispartof Physics Letters B, 2014, vol. 738, p. 144-149
dc.subject Física
dc.title (B)over-bar(s) -> K semileptonic decay from an Omnes improved constituent quark model
dc.type journal article es_ES
dc.date.updated 2016-04-21T11:59:06Z
dc.identifier.doi 10.1016/j.physletb.2014.09.037
dc.identifier.idgrec 101768
dc.rights.accessRights open access es_ES

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