Scalar leptoquarks and the rare B meson decays

Abstract

We study some rare decays of B mesons involving the quark-level transition b→ql+l-(q=d,s) in the scalar leptoquark model. We constrain the leptoquark parameter space using the recently measured branching ratios of Bs,d→μ+μ- processes. Using such parameters, we obtain the branching ratios, direct CP-violation parameters, and isospin asymmetries in the B→Kμ+μ- and B→πμ+μ- processes. We also obtain the branching ratios for some lepton-flavor-violating decays B→li+lj-. We find that the various anomalies associated with the isospin asymmetries of the B→Kμ+μ- process can be explained in the scalar leptoquark model.