Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/131547
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dc.contributor.authorGarra Ticó, Jordi-
dc.contributor.authorGraugés Pous, Eugeni-
dc.contributor.authorBABAR Collaboration-
dc.date.accessioned2019-04-05T11:00:42Z-
dc.date.available2019-04-05T11:00:42Z-
dc.date.issued2008-01-30-
dc.identifier.issn1550-7998-
dc.identifier.urihttp://hdl.handle.net/2445/131547-
dc.description.abstractWe present a search for the decay B + → τ + ν using 383 × 10 6 B ¯¯¯ B pairs collected at the Υ ( 4 S ) resonance with the BABAR detector at the SLAC PEP-II B Factory. We select a sample of events with one completely reconstructed tag B in a hadronic decay mode ( B − → D ( * ) 0 X − ), and examine the rest of the event to search for a B + → τ + ν decay. We identify the τ lepton in the following modes: τ + → e + ν ¯ ν , τ + → μ + ν ¯ ν , τ + → π + ¯ ν , and τ + → π + π 0 ¯ ν . We find a 2.2 σ excess in data and measure a branching fraction of B ( B + → τ + ν ) = ( 1.8 + 0.9 − 0.8 ( stat . ) ± 0.4 ( bkg .   syst . ) ± 0.2 ( other   syst . ) ) × 10 − 4 . We calculate the product of the B meson decay constant f B and | V u b | to be f B ⋅ | V u b | = ( 10.1 + 2.3 − 2.5 ( stat . ) + 1.2 − 1.5 ( syst . ) ) × 10 − 4     GeV .-
dc.format.extent9 p.-
dc.format.mimetypeapplication/pdf-
dc.language.isoeng-
dc.publisherAmerican Physical Society-
dc.relation.isformatofReproducció del document publicat a: https://doi.org/10.1103/PhysRevD.77.011107-
dc.relation.ispartofPhysical Review D, 2008, vol. 77, p. 011107-
dc.relation.urihttps://doi.org/10.1103/PhysRevD.77.011107-
dc.rights(c) American Physical Society, 2008-
dc.subject.classificationFísica de partícules-
dc.subject.classificationExperiments-
dc.subject.otherParticle physics-
dc.subject.otherExperiments-
dc.titleSearch for B+→τ+ν decays with hadronic B tags-
dc.typeinfo:eu-repo/semantics/article-
dc.typeinfo:eu-repo/semantics/publishedVersion-
dc.identifier.idgrec577711-
dc.date.updated2019-04-05T11:00:42Z-
dc.rights.accessRightsinfo:eu-repo/semantics/openAccess-
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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