Angular analysis of B_d⁰ → K^∗ μ⁺ μ⁻ decays in pp collisions at √s=8 TeV with the ATLAS detector

An angular analysis of the decay B _d ⁰ → K ^∗μ ⁺μ ⁻ is presented, based on proton-proton collision data recorded by the ATLAS experiment at the LHC. The study is using 20.3 fb ⁻¹ of integrated luminosity collected during 2012 at centre-of-mass energy of s=8 TeV. Measurements of the K ^* longitudinal polarisation fraction and a set of angular parameters obtained for this decay are presented. The results are compatible with the Standard Model predictions.