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dc.contributor.authorLees, J. P.en_US
dc.contributor.authorPoireau, V.en_US
dc.contributor.authorTisserand, V.en_US
dc.contributor.authorGarra Tico, J.en_US
dc.contributor.authorGrauges, E.en_US
dc.contributor.authorMartinelli, M.en_US
dc.contributor.authorMilanes, D. A.en_US
dc.contributor.authorIzen, Joseph M.en_US
dc.contributor.authorLou, Xinchouen_US
dc.contributor.authorBaBar Collaborationen_US
dc.date.accessioned2014-02-26T22:39:18Z
dc.date.available2014-02-26T22:39:18Z
dc.date.created2012-08-07en_US
dc.date.issued2012-08-07en_US
dc.identifier.issn1550-7998en_US
dc.identifier.urihttp://hdl.handle.net/10735.1/3082
dc.description.abstractWe report measurements of partial branching fractions for inclusive charmless semileptonic B decays B̄→X ulν̄ and the determination of the Cabibbo-Kobayashi-Maskawa (CKM) matrix element |V ub|. The analysis is based on a sample of 467×106 Υ(4S)→BB̄ decays recorded with the BABAR detector at the PEP-II e +e - storage rings. We select events in which the decay of one of the B mesons is fully reconstructed and an electron or a muon signals the semileptonic decay of the other B meson. We measure partial branching fractions ΔB in several restricted regions of phase space and determine the CKM element |V ub| based on different QCD predictions. For decays with a charged lepton momentum pl*>1.0GeV in the B meson rest frame, we obtain ΔB=(1.80±0.13 stat±0.15 sys±0.02 theo)×10 -3 from a fit to the two-dimensional M X-q2 distribution. Here, M X refers to the invariant mass of the final state hadron X and q2 is the invariant mass squared of the charged lepton and neutrino. From this measurement we extract |V ub|=(4.33±0.24 exp±0.15 theo) ×10 -3 as the arithmetic average of four results obtained from four different QCD predictions of the partial rate. We separately determine partial branching fractions for B ̄0 and B - decays and derive a limit on the isospin breaking in B̄→X ulν̄ decays. .en_US
dc.language.isoen_USen_US
dc.publisherAmerican Physical Societyen_US
dc.relation.urihttp://dx.doi.org/10.1103/PhysRevD.86.032004
dc.rights© 2012 American Physical Societyen_US
dc.sourcePhysical Review D - Particles, Fields, Gravitation and Cosmology
dc.subjectQuarksen_US
dc.subjectCP violation (Nuclear physics)en_US
dc.subjectB mesons--Decayen_US
dc.titleStudy of B̅ → X_u ℓν̅ decays in BB̅ events tagged by a fully reconstructed B-meson decay and determination of |V_{ub}|en_US
dc.typeTexten_US
dc.type.genreArticleen_US
dc.identifier.bibliographicCitationLees, J. P., V. Poireau, V. Tisserand, et al. 2012. "Study of B̅ → X_u ℓν̅ decays in BB̅ events tagged by a fully reconstructed B-meson decay and determination of |V_{ub}|" Physical Review D 86(3), doi:10.1103/PhysRevD.86.032004en_US
dc.identifier.volume86en_US
dc.identifier.issue3en_US
dc.contributor.utdAuthorLou, Xinchouen_US
dc.contributor.utdAuthorIzen, Joseph M.en_US
dc.contributor.VIAF250674117 (Izen, JM)en_US
dc.contributor.VIAF250674117 (Izen, JM)
dc.contributor.ORCID0000-0003-0867-2189 (Lou, X)


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