Measurement of an excess of B̄→D(*) τ-ν̄τ decays and implications for charged Higgs bosons
By T. B. C. J. Lees, Others. 2013
749 citations recorded by the source corpus.
Based on the full BABAR data sample, we report improved measurements of the ratios R(D)=B(B→Dτ-ντ)/ B(B→Dl-νl) and R(D*)=B(B→D*τ-ντ)/ B(B→D*l-νl), 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 2.0σ and 2.7σ, respectively. Taken together, the results disagree with these expectations at the 3.4σ 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. © 2013 American Physical Society.
Subfields: Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/c866217c4f8eb54c5c883c7d6b73a80dd406f966
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In Nuclear and High Energy Physics
- Gudrun Heinrich
- Cms Collaboration
- Atlas Collaboration
- Ansgar Denner
- Stefan Dittmaier
- Stefan Kallweit
- Fabio Maltoni
- M. Grazzini
Citations in the corpus
- Simultaneous explanation of the RK and R(D(⁎)) puzzles (2014, methodology): “The SM predictions are R(D) = 0.297± 0.017 and R(D∗) = 0.252± 0.003 [3, 5], which deviate from the BaBar measurements by 2σ and 2.7σ, respectively.”
- Charged Lepton Flavour Violation: An Experimental and Theoretical Introduction (2017, background): “Coming to the second class of observables, data from Babar [212], Belle [213], and LHCb [214] (averaged in [77]) show a combined ≈ 4σ deviation from the theory predictions [215, 216]: RD ≡ BR(B → Dτν)exp/BR(B → Dτν)SM BR(B → D`ν)exp/BR(B → D`ν)SM = 1.34± 0.17 ,(66) RD∗ ≡ BR(B → D∗τν)exp/BR(B → D∗τν)”
- A global likelihood for precision constraints and flavour anomalies (2018, neutral): “We include: • The ratio of K+ → e+ν and K+ → μ+ν, • The branching ratios4 of B → πτν, B+ → τ+ν, B+ → μ+ν, and B+ → e+ν, • The ratios RD(∗) =BR(B →D(∗)τν)/BR(B → D(∗) ν), where the deviations from SM expectations are observed, • The q2 distributions of B → D(∗)τν from Belle [48] and BaBar [49], • FL ”