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http://hdl.handle.net/2445/131702
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DC Field | Value | Language |
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dc.contributor.author | Garra Ticó, Jordi | - |
dc.contributor.author | Graugés Pous, Eugeni | - |
dc.contributor.author | BABAR Collaboration | - |
dc.date.accessioned | 2019-04-08T07:54:39Z | - |
dc.date.available | 2019-04-08T07:54:39Z | - |
dc.date.issued | 2012-11-05 | - |
dc.identifier.issn | 1550-7998 | - |
dc.identifier.uri | http://hdl.handle.net/2445/131702 | - |
dc.description.abstract | We report the results of a study of the exclusive charmless semileptonic decays, B 0 → π − ℓ + ν , B + → π 0 ℓ + ν , B + → ω ℓ + ν , B + → η ℓ + ν , and B + → η ′ ℓ + ν ( ℓ = e or μ ) undertaken with approximately 462 × 10 6 B ¯¯¯ B pairs collected at the Υ ( 4 S ) 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 q 2 , the square of the momentum transferred to the lepton-neutrino pair, for B 0 → π − ℓ + ν , B + → π 0 ℓ + ν , B + → ω ℓ + ν , and B + → η ℓ + ν . From these distributions, we extract the form-factor shapes f + ( q 2 ) and the total branching fractions B ( B 0 → π − ℓ + ν ) = ( 1.45 ± 0.04 stat ± 0.06 syst ) × 10 − 4 (combined π − and π 0 decay channels assuming isospin symmetry), B ( B + → ω ℓ + ν ) = ( 1.19 ± 0.16 stat ± 0.09 syst ) × 10 − 4 and B ( B + → η ℓ + ν ) = ( 0.38 ± 0.05 stat ± 0.05 syst ) × 10 − 4 . We also measure B ( B + → η ′ ℓ + 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 u b | by direct comparison with three different QCD calculations in restricted q 2 ranges of B → π ℓ + ν decays. From a simultaneous fit to the experimental data over the full q 2 range and the FNAL/MILC lattice QCD predictions, we obtain | V u b | = ( 3.25 ± 0.31 ) × 10 − 3 , where the error is the combined experimental and theoretical uncertainty. | - |
dc.format.extent | 31 p. | - |
dc.format.mimetype | application/pdf | - |
dc.language.iso | eng | - |
dc.publisher | American Physical Society | - |
dc.relation.isformatof | Reproducció del document publicat a: https://doi.org/10.1103/PhysRevD.86.092004 | - |
dc.relation.ispartof | Physical Review D, 2012, vol. 86, num. 9, p. 092004 | - |
dc.relation.uri | https://doi.org/10.1103/PhysRevD.86.092004 | - |
dc.rights | (c) American Physical Society, 2012 | - |
dc.source | Articles publicats en revistes (Física Quàntica i Astrofísica) | - |
dc.subject.classification | Física de partícules | - |
dc.subject.classification | Experiments | - |
dc.subject.other | Particle physics | - |
dc.subject.other | Experiments | - |
dc.title | Branching fraction and form-factor shape measurements of exclusive charmless semileptonic B decays, and determination of |Vub| | - |
dc.type | info:eu-repo/semantics/article | - |
dc.type | info:eu-repo/semantics/publishedVersion | - |
dc.identifier.idgrec | 632434 | - |
dc.date.updated | 2019-04-08T07:54:39Z | - |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | - |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
Files in This Item:
File | Description | Size | Format | |
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632434.pdf | 1.4 MB | Adobe PDF | View/Open |
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