Implications of $b\to s$ measurements

Understand

The recent updated angular analysis of the $B\to K^*\mu^+\mu^-$ decay by the LHCb collaboration is interpreted by performing a global fit to all relevant measurements probing the flavour-changing neutral current $b\to s\mu^+\mu^-$ 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 $3.7\sigma$.
• The tension even increases to $4.2\sigma$ including also $b\to se^+e^-$ measurements and assuming new physics to affect the muonic modes only.