Abstract
The angular distributions and the differential branching fraction of the decay $B^0→K^⁎(892)^0μ^+μ^−$ are studied using data corresponding to an integrated luminosity of 20.5 $fb{−1}$ collected with the CMS detector at the LHC in pp collisions at $\sqrt{s} = 8$ TeV . From 1430 signal decays, the forward–backward asymmetry of the muons, the $K^⁎(892)^0$ longitudinal polarization fraction, and the differential branching fraction are determined as a function of the dimuon invariant mass squared. The measurements are among the most precise to date and are in good agreement with standard model predictions.