Custodial bulk Randall-Sundrum model and B→K*l+l′-

The custodial Randall-Sundrum model based on SU(2)L×SU(2)R×U(1) B-L generates new flavor-changing-neutral-current (FCNC) phenomena at tree level, mediated by Kaluza-Klein (KK) neutral gauge bosons. Based on two natural assumptions of universal 5D Yukawa couplings and no cancellation in explaining the observed standard model (SM) fermion mixing matrices, we determine the bulk Dirac mass parameters. Phenomenological constraints from lepton-flavor violations are also used to specify the model. From the comprehensive study of B→K*l+l′-, we found that only the B→K*e+e- decay has sizable new physics effects. The zero value position of the forward-backward asymmetry in this model is also evaluated, with about 5% deviation from the SM result. Other effective observables are also suggested such as the ratio of two differential (or partially integrated) decay rates of B→K*e+e- and B→K*μ+μ-. For the first KK gauge boson mass of MA(1)=2-4TeV, we can have about 10%-20% deviation from the SM results.