B Decays and Lepton Flavour (Universality) Violation
Crivellin, Andreas
Original · EN
LHCb found hints for physics beyond the standard model in B→ K*μ+μ-, B→ K*μ+μ-/B→ K*e+e- and Bₛ→ϕμ+μ-. In addition, the BABAR results for B→ D⁽*⁾τν and the CMS excess in h→τ±μ∓ also point towards lepton flavour (universality) violating new physics. While B→ D⁽*⁾τν and h→τ±μ∓ can be naturally explained by an extended Higgs sector, the probably most promising explanation for the b→ sμμ anomalies is a Z' boson. Furthermore, combining a 2HDM with a gauged Lμ-Lτ symmetry allows for explaining the b→ sμ+μ- anomalies and h→τ±μ∓ simultaneously, with interesting correlations to τ→3μ. In the light of these deviations from the SM we also discuss the possibilities of observing lepton flavour violating B decays (e.g. B→ K⁽*⁾τ±μ∓ and Bₛ→τ±μ∓) in Z′ models.
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