Angular analysis and differential branching fraction of the decay: $B → K^⁎μ^+μ^−$

Measurements of rare B meson decay properties provide an alternative approach to direct searches for physics beyond the Standard Model. These decays, which proceed through flavor-changing neutral currents, can have interferences from new physics through loop diagrams and hence an excellent probe. In particular, the angular distribution of the decay B→K⁎μ+μ− can be measured to estimate the forward-backward asymmetries of the muons, the longitudinal polarization fractions of K⁎ and the differential branching fractions, as a function of the dimuon invariant mass. Results based on data recorded by the CMS experiment at centre-of-mass energy of 7 TeV are presented.