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http://hdl.handle.net/2445/131732
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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 | 2019-04-08T09:28:25Z | - |
dc.date.available | 2019-04-08T09:28:25Z | - |
dc.date.issued | 2010-02-07 | - |
dc.identifier.issn | 1550-7998 | - |
dc.identifier.uri | http://hdl.handle.net/2445/131732 | - |
dc.description.abstract | We present an analysis of exclusive charmless semileptonic B -meson decays based on 377 × 10 6 B ¯¯¯ B pairs recorded with the BABAR detector at the Υ ( 4 S ) resonance. We select four event samples corresponding to the decay modes B 0 → π − ℓ + ν , B + → π 0 ℓ + ν , B 0 → ρ − ℓ + ν , and B + → ρ 0 ℓ + ν and find the measured branching fractions to be consistent with isospin symmetry. Assuming isospin symmetry, we combine the two B → π ℓ ν samples, and similarly the two B → ρ ℓ ν samples, and measure the branching fractions B ( B 0 → π − ℓ + ν ) = ( 1.41 ± 0.05 ± 0.07 ) × 10 − 4 and B ( B 0 → ρ − ℓ + ν ) = ( 1.75 ± 0.15 ± 0.27 ) × 10 − 4 , where the errors are statistical and systematic. We compare the measured distribution in q 2 , the momentum transfer squared, with predictions for the form factors from QCD calculations and determine the Cabibbo-Kobayashi-Maskawa matrix element | V u b | . Based on the measured partial branching fraction for B → π ℓ ν in the range q 2 < 12 GeV 2 and the most recent QCD light-cone sum-rule calculations, we obtain | V u b | = ( 3.78 ± 0.13 + 0.55 − 0.40 ) × 10 − 3 , where the errors refer to the experimental and theoretical uncertainties. From a simultaneous fit to the data over the full q 2 range and the FNAL/MILC lattice QCD results, we obtain | V u b | = ( 2.95 ± 0.31 ) × 10 − 3 from B → π ℓ ν , where the error is the combined experimental and theoretical uncertainty. | - |
dc.format.extent | 45 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.83.032007 | - |
dc.relation.ispartof | Physical Review D, 2010, vol. 83, num. 3, p. 032007 | - |
dc.relation.uri | https://doi.org/10.1103/PhysRevD.83.032007 | - |
dc.rights | (c) American Physical Society, 2010 | - |
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 | Study of B→πlν and B→ρlν decays and determination of |Vub| | - |
dc.type | info:eu-repo/semantics/article | - |
dc.type | info:eu-repo/semantics/publishedVersion | - |
dc.identifier.idgrec | 601948 | - |
dc.date.updated | 2019-04-08T09:28:25Z | - |
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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601948.pdf | 2.85 MB | Adobe PDF | View/Open |
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