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

We summarize the status of the analysis of the 4-body angular distribution $B \to K^*(\to K π) μ^+μ^-$ using a basis of optimized observables. We provide a New Physics interpretation of the pattern of deviations observed in the 1fb$^{-1}$ dataset with the coefficient of the semileptonic operator $O_9$ being the main responsible for this pattern. Also other scenarios involving more Wilson coefficients are briefly discussed. Further, we present a detailed description of each of the hadronic uncertainties entering our predictions and suggest possible tests for alternative hadronic explanations. Our most accurate SM predictions for the optimized observables in various bins including all uncertainties are also provided.

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