Tauonic $B$ decays and Higgs mediated flavour violation

In these proceedings we review the impact of the tauonic $B$ decays $B\toτν$, $B\to Dτν$ and $B\to D^*τν$ on Higgs mediated flavour violation. For this purpose we study a 2HDM with generic flavour structure (of type III). We find that despite the stringent constraints from FCNC processes sizable effects in tauonic $B$ decays are possible if top-related flavour violation is large and that the tensions with the SM predictions can be resolved even when taking into account the recent CMS bounds on $A^0\toτ^+τ^-$.

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