RK and future b → sll physics beyond the standard model opportunities

Flavor changing neutral current (FCNC) vertical bar Delta B vertical bar = vertical bar Delta S vertical bar = 1 processes are sensitive to possible new physics at the electroweak scale and beyond, providing detailed information about flavor, chirality and Lorentz structure. Recently the LHCb Collaboration announced a 2.6s deviation in the measurement of R-K = ((B) over bar -> (K) over bar mu mu)/ ((B) over bar -> (K) over bar ee) from the standard model's prediction of lepton universality. We identify dimension-six operators that could explain this deviation and study constraints from other measurements. Vector and axial-vector four-fermion operators with flavor structure (s) over barb (l) over barl can provide a good description of the data. Tensor operators cannot describe the data. Pseudoscalar and scalar operators only fit the data with some fine-tuning; they can be further probed with the (B) over bar -> (K) over bar ee angular distribution. The data appear to point towards C-9(NP mu) = -C-10(NP mu) < 0, an SU(2)(L) invariant direction in parameter space supported by RK, the <(B)over bar> -> (K) over bar*mu mu forward-backward asymmetry and the (B-s) over bar -> mu mu branching ratio, which is currently allowed to be smaller than the standard model prediction. We present two leptoquark models which can explain the FCNC data and give predictions for the LHC and rare decays.