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Transitions of the type $b \to s l^+ l^-$ are flavour changing neutralcurrent processes where new physics can enter in competing loop diagrams withrespect to the Standard Model contributions. In these decays severalobservables sensitive to new physics, and where theoretical uncertainties areunder control, can be constructed. Particularly interesting are the angularasymmetries in the decay $B_d \to K^* \mu^+ \mu^-$ and the measurement of thebranching fraction of the decays $B_{s,d} \to \mu^+ \mu^-$. Recent measurementsof these observables and the measurement of the isospin asymmetry in the decays$B \to K^{(*)} \mu^+ \mu^-$ are presented.

Search for new physics in $B_s \rightarrow \mu^+ \mu^-$ and $B \rightarrow K^{(*)} \mu^+ \mu^-$