Tree-level new physics in R(K(∗))

Abstract

We implement the [Formula: see text] fit for [Formula: see text] with possible tree-level new physics in a model-independent parametrization. Relevant Wilson coefficients are decomposed into the new physics scale, its power, and the fermionic couplings. Constraints from the branching ratio of [Formula: see text] can be naturally incorporated with the scheme. For a reasonable set of the parameter ranges it is found that the new physics is less than [Formula: see text]. Some new physics models including the leptoquark, [Formula: see text], etc. can be embraced within our framework. We give comments on new LHCb data which are close to the standard model predictions.