Hint of lepton flavou non-universality in B meson decays

The LHCb collaboration has recently presented their result on R-K = B(B+ -> K+ mu(+) mu(-)) /B(B+ -> K(+)e(+)e(-)) for the dilepton invariant mass bin m 2 m(ll)(2) = 1 - 6 GeV2 (l = mu,e). The measurement shows an intriguing 2.6 sigma deviation from the Standard Model (SM) prediction. In view of this, we study model independent New Physics (NP) explanations of R K consistent with other measurements involving b -> sl(+) l(-) transition, relaxing the assumption of lepton universality. We perform a Bayesian statistical fit to the NP Wilson Coefficients and compare the Bayes Factors of the different hypotheses in order to quantify their goodness-of-fit. We show that the data slightly favours NP in the muon sector over NP in the electron sector.