Branching Fraction and Form-Factor Shape Measurements of Exclusive Charmless Semileptonic B Decays, and Determination of |V_{ub}|

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dc.contributor.ORCID0000-0003-0867-2189 (Lou, X)
dc.contributor.VIAF250674117 (Izen, JM)en_US
dc.contributor.VIAF250674117 (Izen, JM)
dc.contributor.authorLees, J. P.en_US
dc.contributor.authorPoireau, V.en_US
dc.contributor.authorTisserand, V.en_US
dc.contributor.authorTico, J. Garraen_US
dc.contributor.authorGrauges, E.en_US
dc.contributor.authorPalano, A.en_US
dc.contributor.authorEigen, G.en_US
dc.contributor.authorIzen, Joseph M.en_US
dc.contributor.authorLou, Xinchouen_US
dc.contributor.authorBaBar Collaborationen_US
dc.contributor.utdAuthorLou, Xinchouen_US
dc.contributor.utdAuthorIzen, Joseph M.en_US
dc.date.accessioned2014-03-19T19:17:20Z
dc.date.available2014-03-19T19:17:20Z
dc.date.created2012-11-05en_US
dc.date.issued2012-11-05en_US
dc.description.abstractWe report the results of a study of the exclusive charmless semileptonic decays, B0→π -+ν, B+ → π0⁺ν, B +→ω +ν, B +→η +ν, and B +→η ′+ν (=e or μ) undertaken with approximately 462×106 BB̄ pairs collected at the Υ(4S) resonance with the BABAR detector. The analysis uses events in which the signal B decays are reconstructed with a loose neutrino reconstruction technique. We obtain partial branching fractions in several bins of q2, the square of the momentum transferred to the lepton-neutrino pair, for B0→π - +ν, B +→π0 +ν, B +→ω +ν, and B +→η +ν. From these distributions, we extract the form-factor shapes f +(q2) and the total branching fractions B(B0→π -+ν)=(1.45±0.04 stat±0.06 syst)×10 -4 (combined π - and π0 decay channels assuming isospin symmetry), B(B +→ω +ν)=(1.19±0.16 stat±0.09 syst)×10 -4 and B(B +→η +ν)=(0.38±0.05 stat±0.05 syst)×10 -4. We also measure B(B +→η ′+ν)=(0.24±0. 08 stat±0.03 syst)×10 -4. We obtain values for the magnitude of the Cabibbo-Kobayashi-Maskawa (CKM) matrix element |V ub| by direct comparison with three different QCD calculations in restricted q2 ranges of B→π +ν decays. From a simultaneous fit to the experimental data over the full q2 range and the FNAL/MILC lattice QCD predictions, we obtain |V ub|=(3.25±0.31)×10 -3, where the error is the combined experimental and theoretical uncertainty. © 2012 American Physical Society.en_US
dc.identifier.bibliographicCitationLees, J. P., V. Poireau, V. Tisserand, J. Garra Tico, et al. 2012. "Branching fraction and form-factor shape measurements of exclusive charmless semileptonic B decays, and determination of |V_{ub}|." Physical Review D - Particles, Fields, Gravitation and Cosmology 86(9), doi:10.1103/PhysRevD.86.092004en_US
dc.identifier.issn1550-7998en_US
dc.identifier.issue9en_US
dc.identifier.urihttp://hdl.handle.net/10735.1/3177
dc.identifier.volume86en_US
dc.language.isoen_USen_US
dc.publisherAmerican Physical Societyen_US
dc.relation.urihttp://dx.doi.org/10.1103/PhysRevD.86.092004
dc.rights© 2012 American Physical Societyen_US
dc.sourcePhysical Review D - Particles, Fields, Gravitation and Cosmology
dc.subjectBranching fractions (Nuclear physics)en_US
dc.subjectLeptons (Nuclear physics)en_US
dc.subjectQuantum chromodynamicsen_US
dc.titleBranching Fraction and Form-Factor Shape Measurements of Exclusive Charmless Semileptonic B Decays, and Determination of |V_{ub}|en_US
dc.typeTexten_US
dc.type.genreArticleen_US

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Lou, Xinchou
Izen, Joseph M.