Differential branching fraction and angular analysis of the decay B 0 → K ∗0 μ + μ −

The angular distribution and differential branching fraction of the decay B 0→ K ∗0 μ + μ − are studied using a data sample, collected by the LHCb experiment in pp collisions at √s=7 TeV, corresponding to an integrated luminosity of 1.0 fb−1. Several angular observables are measured in bins of the dimuon invariant mass squared, q 2. A first measurement of the zero-crossing point of the forward-backward asymmetry of the dimuon system is also presented. The zero-crossing point is measured to be q₀²=4.9± 0.9\;GeV² / c⁴ . , where the uncertainty is the sum of statistical and systematic uncertainties. The results are consistent with the Standard Model predictions.