B-meson charged current anomalies: the post-Moriond status

Abstract

In this note, we discuss the impact of the recent Belle result on the various theoretical explanations of the $R_D$ and $R_{D^{\ast }}$ anomalies. The pure tensor explanation, which was strongly disfavoured by the measurements of $F_L^{D^{\ast }}$ and high-$p_T$ $pp\to \tau \nu$ searches before Moriond, is now completely allowed because of reduction of the experimental world-average. Moreover, the pure right-chiral vector solution (involving right-chiral neutrinos) has now moved into the $2\sigma$ allowed range of the LHC $pp\to \tau \nu$ searches. We also critically re-examine the bound on $\mathcal{B}(B_c^{-}\to {\tau }^{-}{\bar{\nu }}_{\tau })$ from LEP data and show that the bound is considerably weaker than the number $10\%$ often used in the recent literature.

arXiv commentVersion to be published in Phys. Rev. D, Rapid Communications

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