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http://hdl.handle.net/2445/131776
Title: | Measurement of an excess of ¯B → D(*)τ−¯ντ decays and implications for charged Higgs bosons |
Author: | Graugés Pous, Eugeni BABAR Collaboration |
Keywords: | Física de partícules Experiments Bosons de Higgs Particle physics Experiments Higgs bosons |
Issue Date: | 31-Oct-2013 |
Publisher: | American Physical Society |
Abstract: | Based 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 − ¯ ν ℓ ) and R ( D ∗ ) = B ( ¯¯¯ B → D ∗ τ − ¯ ν τ ) / B ( ¯¯¯ B → D ∗ ℓ − ¯ ν ℓ ) , where ℓ refers to either an electron or muon. 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, the 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. Kinematic distributions presented here exclude large portions of the more general type III two-Higgs-doublet model, but there are solutions within this model compatible with the results. |
Note: | Reproducció del document publicat a: https://doi.org/10.1103/PhysRevD.88.072012 |
It is part of: | Physical Review D, 2013, vol. 88, num. 7, p. 072012 |
URI: | http://hdl.handle.net/2445/131776 |
Related resource: | https://doi.org/10.1103/PhysRevD.88.072012 |
ISSN: | 1550-7998 |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
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631644.pdf | 4.22 MB | Adobe PDF | View/Open |
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