B decays with $\tau$-leptons in non-universal left-right models

Understand

Recent measurements of semileptonic $B$-meson decays into $\tau$-leptons are somewhat higher than expected in the standard model.

• Although the deviations are less than 3$\sigma$, they suggest the possibility of new physics affecting primarily the $\tau$-lepton.
• In this paper we examine these results within the context of non-universal left-right models.
• We find that strong constraints from $b\to s \gamma$ on $W-W^\prime$ mixing lead to a prediction of approximately equal enhancements for the $B\to D \tau \nu$ and the $B\to D^\star \tau \nu$ modes.