Rare decays B → Xsl+l− and B → K(*)l+l− in SM and beyond

Abstract

After a brief review of the inclusive and exclusive rare semileptonic decays of B mesons in the standard model (SM), an overview of recent theoretical developments in this field is given. New physics effects on various observables such as branching ratio, backward-forward asymmetry, polarization of lepton and CP violation in the decays are analyzed in models beyond SM (supersymmetric models and two Higgs doublet models).