Lepton polarization asymmetries in B to X_s τ^+ τ^- in MSSM

Semi-leptonic and leptonic decays of B-mesons are important probes for testing SM and theories beyond it because of their relative cleanliness and far less theoretical uncertainties. In semi-leptonic decays based on quark level transition $b \to s \tau^+ \tau^-$ apart from branching ratio one can study many other (possible) observables associated with final state leptons like, lepton pair Forward Backward asymmetry, lepton polarization asymmetries etc. But as proposed recently if we can tag the B-meson than one can measure the polarization asymmetries of both the leptons. Here we will study the polarization asymmetries of both the final state leptons in SM and Minimal Supersymmetric Extension (MSSM) to it.