Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/131742
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dc.contributor.authorGarra Ticó, Jordi-
dc.contributor.authorGraugés Pous, Eugeni-
dc.contributor.authorBABAR Collaboration-
dc.date.accessioned2019-04-08T10:08:52Z-
dc.date.available2019-04-08T10:08:52Z-
dc.date.issued2010-03-30-
dc.identifier.issn1550-7998-
dc.identifier.urihttp://hdl.handle.net/2445/131742-
dc.description.abstractWe present a search for the decay B + → ℓ + ν ℓ ( ℓ = τ , μ ,   or   e ) in ( 458.9 ± 5.1 ) × 10 6 B ¯¯¯ B pairs recorded with the BABAR detector at the PEP-II B -factory. We search for these B decays in a sample of B + B − events where one B -meson is reconstructed as B − → D 0 ℓ − ¯ ν X . Using the method of Feldman and Cousins, we obtain B ( B + → τ + ν τ ) = ( 1.7 ± 0.8 ± 0.2 ) × 10 − 4 , which excludes zero at 2.3 σ . We interpret the central value in the context of the standard model and find the B meson decay constant to be f 2 B = ( 62 ± 31 ) × 10 3     MeV 2 . We find no evidence for B + → e + ν e and B + → μ + ν μ and set upper limits at the 90% C.L. B ( B + → e + ν e ) < 0.8 × 10 − 5 and B ( B + → μ + ν μ ) < 1.1 × 10 − 5 .-
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.81.051101-
dc.relation.ispartofPhysical Review D, 2010, vol. 81, num. 5, p. 051101-
dc.relation.urihttps://doi.org/10.1103/PhysRevD.81.051101-
dc.rights(c) American Physical Society, 2010-
dc.subject.classificationFísica de partícules-
dc.subject.classificationExperiments-
dc.subject.otherParticle physics-
dc.subject.otherExperiments-
dc.titleSearch for B+→ℓ+νℓ recoiling against B−→D0ℓ−¯νX-
dc.typeinfo:eu-repo/semantics/article-
dc.typeinfo:eu-repo/semantics/publishedVersion-
dc.identifier.idgrec601930-
dc.date.updated2019-04-08T10:08:52Z-
dc.rights.accessRightsinfo:eu-repo/semantics/openAccess-
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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