Angular analysis of the $B^0_d \to K^* \mu \mu$ at CMS and ATLAS

New Physics (NP) beyond the Standard Model (SM) can be re-vealed by analysing processes which are expected to occur with very low probabil-ity in the SM; among these, the flavour-changing neutral current (FCNC) decay $B_d^0 \rightarrow K^{*0}\mu^+\mu^-$ is particularly promising. Recent results from the LHCb Collabo-ration show that the expected values of the parameter $P_5^′$ differ by more than threestandard deviations from the measurements in a well-defined interval of the dimuon invariant mass. The results of angular analyses performed by the ATLAS and CMS experiments at the LHC are here presented and compared with other experiments and several theoretical predictions.