Explaining the RK and RD (∗) anomalies with vector leptoquarks

Abstract

Recently, the B factories BABAR and Belle as well as the LHCb experiment have reported several anomalies in the semileptonic B meson decays, such as the RK and RD(∗) etc. We investigate these deviations by considering the vector leptoquarks relevant for both b→sl+l- and b→clνl transitions. The leptoquark parameter space is constrained by using the experimentally measured branching ratios of Bs→l+l-, B→Xsl+l-(νν), and Bu+→l+νl processes. Using the constrained leptoquark couplings, we compute the branching ratios, forward-backward asymmetries, τ, and D∗ polarization parameters in the B→D(∗)lνl processes. We find that the vector leptoquarks can explain both the RD(∗) and RK anomalies, simultaneously. Furthermore, we study the rare leptonic Bu,c∗→lν decay processes in this model.