Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/132915
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dc.contributor.authorGarra Ticó, Jordi-
dc.contributor.authorGraugés Pous, Eugeni-
dc.contributor.authorBABAR Collaboration-
dc.date.accessioned2019-05-09T10:42:50Z-
dc.date.available2019-05-09T10:42:50Z-
dc.date.issued2012-09-06-
dc.identifier.issn0031-9007-
dc.identifier.urihttp://hdl.handle.net/2445/132915-
dc.description.abstractBased on the full BABAR data sample, we report improved measurements of the ratios R ( D ( * ) ) = B ( ¯¯¯ B → D ( * ) τ − ¯ ν τ ) / B ( ¯¯¯ B → D ( * ) ℓ − ℓ ¯ ν ℓ ) , where ℓ is either e or μ . These ratios are sensitive to new physics contributions in the form of a charged Higgs boson. We measure R ( D ) = 0.440 ± 0.058 ± 0.042 and R ( D ∗ ) = 0.332 ± 0.024 ± 0.018 , which exceed the standard model expectations by 2.0 σ and 2.7 σ , respectively. Taken together, our results disagree with these expectations at the 3.4 σ level. This excess cannot be explained by a charged Higgs boson in the type II two-Higgs-doublet model.-
dc.format.extent8 p.-
dc.format.mimetypeapplication/pdf-
dc.language.isoeng-
dc.publisherAmerican Physical Society-
dc.relation.isformatofReproducció del document publicat a: https://doi.org/10.1103/PhysRevLett.109.101802-
dc.relation.ispartofPhysical Review Letters, 2012, vol. 109, num. 10, p. 101802-
dc.relation.urihttps://doi.org/10.1103/PhysRevLett.109.101802-
dc.rights(c) American Physical Society, 2012-
dc.sourceArticles publicats en revistes (Física Quàntica i Astrofísica)-
dc.subject.classificationFísica de partícules-
dc.subject.classificationExperiments-
dc.subject.otherParticle physics-
dc.subject.otherExperiments-
dc.titleEvidence for an Excess of ¯¯¯B→D(*)τ−¯ντ Decays-
dc.typeinfo:eu-repo/semantics/article-
dc.typeinfo:eu-repo/semantics/publishedVersion-
dc.identifier.idgrec654971-
dc.date.updated2019-05-09T10:42:50Z-
dc.rights.accessRightsinfo:eu-repo/semantics/openAccess-
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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