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http://hdl.handle.net/2445/130865
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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 | 2019-03-25T13:33:49Z | - |
dc.date.available | 2019-03-25T13:33:49Z | - |
dc.date.issued | 2012-08-07 | - |
dc.identifier.issn | 1550-7998 | - |
dc.identifier.uri | http://hdl.handle.net/2445/130865 | - |
dc.description.abstract | We report measurements of partial branching fractions for inclusive charmless semileptonic B decays ¯¯¯ B → X u ℓ ¯ ν and the determination of the Cabibbo-Kobayashi-Maskawa (CKM) matrix element | V u b | . The analysis is based on a sample of 467 × 10 6 Υ ( 4 S ) → B ¯¯¯ B 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 Δ B in several restricted regions of phase space and determine the CKM element | V u b | based on different QCD predictions. For decays with a charged lepton momentum p ∗ ℓ > 1.0 GeV in the B meson rest frame, we obtain Δ B = ( 1.80 ± 0.13 stat ± 0.15 sys ± 0.02 theo ) × 10 − 3 from a fit to the two-dimensional M X − q 2 distribution. Here, M X refers to the invariant mass of the final state hadron X and q 2 is the invariant mass squared of the charged lepton and neutrino. From this measurement we extract | V u b | = ( 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 ¯¯¯ B → X u ℓ ¯ ν decays. | - |
dc.format.extent | 23 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.86.032004 | - |
dc.relation.ispartof | Physical Review D, 2012, vol. 86, num. 3, p. 32004 | - |
dc.relation.uri | https://doi.org/10.1103/PhysRevD.86.032004 | - |
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.classification | Mesons (Física nuclear) | - |
dc.subject.other | Particle physics | - |
dc.subject.other | Experiments | - |
dc.subject.other | Mesons (Nuclear physics) | - |
dc.title | Study of ¯¯B → Xuℓ¯ν decays in B¯¯B events tagged by a fully reconstructed B-meson decay and determination of |Vub| | - |
dc.type | info:eu-repo/semantics/article | - |
dc.type | info:eu-repo/semantics/publishedVersion | - |
dc.identifier.idgrec | 654976 | - |
dc.date.updated | 2019-03-25T13:33:49Z | - |
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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654976.pdf | 700.92 kB | Adobe PDF | View/Open |
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