Impact of leptoquarks in semileptonic B decays

We study the impact of vector leptoquarks on the recent anomalies in semileptonic $B$ meson decays such as $R_K$ and $R_{D^{(\ast )}}$ etc. We constrain the leptoquark couplings by using the existing data on the branching ratios of $B_s\to l^{+}{l}^{-}$ and $\bar{B}\to X_s{l}^{+}{l}^{-}$ processes, where $l=e,\mu ,\tau$. We estimate the branching ratios of $\bar B \to D^{(*)} l \bar \nu_l$ processes using the constrained leptoquark parameter space. We also investigate the possibility of simultaneous explanation of $R_{D^{(\ast )}}$, $R_K$ anomalies in this model.