Implications of $b\to s$ measurements

The recent updated angular analysis of the $B\to K^*μ^+μ^-$ decay by the LHCb collaboration is interpreted by performing a global fit to all relevant measurements probing the flavour-changing neutral current $b\to sμ^+μ^-$ transition. A significant tension with Standard Model expectations is found. A solution with new physics modifying the Wilson coefficient $C_9$ is preferred over the Standard Model by $3.7σ$. The tension even increases to $4.2σ$ including also $b\to se^+e^-$ measurements and assuming new physics to affect the muonic modes only. Other new physics benchmarks are discussed as well. The $q^2$ dependence of the shift in $C_9$ is suggested as a means to identify the origin of the tension - new physics or an unexpectedly large hadronic effect.

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