Minimal Leptoquark Explanation for the RD(*) , RK , and (g−2)μ Anomalies

We show that by adding a single new scalar particle to the standard model, a TeV-scale leptoquark with the quantum numbers of a right-handed down quark, one can explain in a natural way three of the most striking anomalies of particle physics: the violation of lepton universality in $overline{B}ensuremath{rightarrow}overline{K}{ensuremath{ell}}^{+}{ensuremath{ell}}^{ensuremath{-}}$ decays, the enhanced $overline{B}ensuremath{rightarrow}{D}^{(*)}ensuremath{tau}overline{ensuremath{nu}}$ decay rates, and the anomalous magnetic moment of the muon. Constraints from other precision measurements in the flavor sector can be satisfied without fine-tuning. Our model predicts enhanced $overline{B}ensuremath{rightarrow}{overline{K}}^{(*)}ensuremath{nu}overline{ensuremath{nu}}$ decay rates and a new-physics contribution to ${B}_{s}ensuremath{-}{overline{B}}_{s}$ mixing close to the current central fit value.