Evidence for an excess of B → D(*)τν decays
By B. Kowalewski. Physical Review Letters, 2012
709 citations recorded by the source corpus.
The full data sample from the BaBar experiment is used to measure the ratios of branching fractions and , where ℓ refers to an electron or muon. These ratios are sensitive to the presence of new physics in charged current decays and are sensitive probes for charged Higgs bosons. These ratios are predicted in the standard model with small theoretical uncertainties, and many experimental uncertainties cancel in the ratio. The measured values, R(D) = 0.440 ± 0.058 ± 0.042 and R(D*) = 0.332 ± 0.024 ± 0.018, exceed standard model expectations by 2.0σ and 2.7σ, respectively. Accounting for correlations, the combined departure from the standard model is 3.4σ. The measured values are not compatible with a charged Higgs boson in type-II two-Higgs-doublet models, but can be accommodated in more general models involving charged mediators.
Subfields: Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/43838ca8dc95684f8c866dc020755af05d6c00e5
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Citations in the corpus
- Review of lepton universality tests in B decays (2018, methodology): “27 — [77,78] Belle (2015) Had τ−→ `′− ν`′ντ 0.”
- Maximal flavour violation: a Cabibbo mechanism for leptoquarks (2018, positive): “Current measurements of the R(D(∗)) = B(B → D(∗)τν)/B(B → D(∗)`ν) (` = e, μ) ratios performed by BaBar [2, 3], Belle [8–11] and LHCb [6, 13, 68] point to a large deviation away from lepton flavour universality (LFU).”
- Update of the global electroweak fit and constraints on two-Higgs-doublet models (2018, neutral): “For the branching fraction of the radiative decay B(B → Xsγ) with Eγ > 1.6 GeV we use the value of the Heavy Flavour Averaging Group (HFLAV) [98] which combines measurements from the BABAR [105–107], Belle [108–110], and CLEO [111] experiments.”