Lepton universality violation with lepton flavor conservation in B-meson decays

By R. Alonso, B. Grinstein, J. Camalich. 2015

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A bstractAnomalies in semileptonic B-meson decays present interesting patterns that might be revealing the shape of the new physics to come. Under the assumption that neutrino and charged lepton mass terms are the only sources of flavor violation and given the hierarchy between the two, we find that charged lepton universality violation without charged lepton flavor violation naturally arises. This can account for a deficit of B+ → K+μμ over B+ → K+ee decays with new physics coupled predominantly to muons and a new physics scale of a few TeV. A generic prediction of this scenario is a large enhacement of tauonic B decay rates that, in particular, could accommodate an excess in B → D(∗)τ ν. For the most part, the study is carried out in an effective field theory framework with an underlying SU(2)L × U(1)Y symmetry that emphasizes the model-independent correlations between low- and high-energy observables. As an example, a connection between B-decays and top physics is pointed out. To complement the discussion, all possible (spin 0 and 1) leptoquark models are matched to the low-energy field theory so that the effective analysis can be used to survey these candidates for new physics.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/e17822532e5a3260ec8d19dbed404db2c7cb9f3a

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In Nuclear and High Energy Physics

Citations in the corpus

Combined explanations of the b→sμ+μ− and b→cτ−ν¯ anomalies: A general model analysis (2018, background): “[27], it is pointed out that it is possible to construct models that violate LFU,”
Physics case for an LHCb Upgrade II - Opportunities in flavour physics, and beyond, in the HL-LHC era (2018, background): “For different models, not excluded by the current experimental constraints, the expected branching fraction for the LFV process B0 s→ τ±μ∓ is in the range 10−9−10−4 [269, 270,273,279–288].”