Binned angular analysis of $B^{0} \to K^{*0} \mu^{+} \mu^{-}$ with LHCb

Abstract

The analysis of $b\to s\ell^+\ell^-$ flavor-changing neutral current decays is a powerful test of the Standard Model (SM). Due to the strong suppression of these modes in the SM, potential New Physics contributions can have a significant impact on the measured physics observables. The angular analysis of $B^{0} \to K^{*0} \mu^{+} \mu^{-}$ decays gives access to optimized angular observables, which are less dependent on hadronic form factors than for example branching fraction measurements. The angular observables are extracted in bins of the invariant dimuon mass squared, $q^2$, making the analysis model-independent with respect to any assumptions about the shape of the signal distribution in $q^2$. Previous binned measurements of the $B^{0} \to K^{*0} \mu^{+} \mu^{-}$ angular observables by LHCb were in tension with the SM at the level of $3.3$ standard deviations ($\sigma$). These proceedings present the ongoing effort to update the binned angular analysis to include the full Run 1 and Run 2 data sample of LHCb.