Angular analysis of $B_d \to K^*\mu^+\mu^-$ decay with the ATLAS detector

An angular analysis of the decay $B_d \to K^*\mu^+\mu^-$ is presented using proton-proton collisions at 8 TeV from LHC data analysed with the ATLAS detector. The study is based on 20.3 fb$^{−1}$ of integrated luminosity collected during 2012. Measurements of the K* longitudinal polarisation fraction and a set of angular parameters obtained for this decay are presented. The results are consistent with theoretical predictions.