A closer look at isodoublet vector leptoquark solution to $R_{D^{(\ast )}}$ anomaly

Abstract

We discuss a model with a SU$(2{)}_L$ doublet vector leptoquark (LQ), motivated by the recent experimental results relating to the lepton universality of $\overline{B}\to D^{(\ast )}\tau {\overline{\nu }}_{\tau }$. We find that scalar operators predicted by the LQ are favored to explain the deviations, taking into account the recent LHCb result. We investigate the extensive phenomenology of the model and conclude that $B_s\to \tau \overline{\tau }$, $B\to K\tau \overline{\tau }$, $B_u\to \tau {\overline{\nu }}_{\tau }$ and high-$p_T$ di-$\tau$ lepton signatures at the LHC will probe the interesting parameter region in the near future.

Comments: 27 pages, 7 figures, 2 tables, published in JHEP