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

TL;DR

This paper reports on an updated binned angular analysis of the decay $B^{0} o K^{*0} \mu^{+} \mu^{-}$ using the full LHCb data, aiming to test the Standard Model and search for potential New Physics effects.

Contribution

It presents an improved, model-independent angular analysis of $B^{0} o K^{*0} \mu^{+} \mu^{-}$ decays with the full LHCb dataset, refining previous measurements and addressing tensions with the SM.

Findings

Previous measurements showed 3.3 sigma deviation from SM.

Updated analysis includes full Run 1 and Run 2 data.

Results will clarify potential signs of New Physics.

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.