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We summarize the status of the analysis of the 4-body angular distribution $B\to K^*(\to K \pi) \mu^+\mu^-$ using a basis of optimized observables. Weprovide a New Physics interpretation of the pattern of deviations observed inthe 1fb$^{-1}$ dataset with the coefficient of the semileptonic operator $O_9$being the main responsible for this pattern. Also other scenarios involvingmore Wilson coefficients are briefly discussed. Further, we present a detaileddescription of each of the hadronic uncertainties entering our predictions andsuggest possible tests for alternative hadronic explanations. Our most accurateSM predictions for the optimized observables in various bins including alluncertainties are also provided.

Theoretical status of $B \to K^* \mu^+\mu^-$: The path towards New Physics