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In the pursuit of physics beyond the Standard Model, a promising path is thestudy of B-meson decays caused by the transition $b \to s\ell^+\ell^-$. A keyobservable in such decays is the ratio $R_K$, which measures electron--muonuniversality in $B \to K \mu^+\mu^-/e^+e^-$. At first sight, the recent LHCbmeasurement of $R_K \sim 1$ may seem to largely constrain deviations fromuniversality in these decays. However, we show that this is actually not thecase: new sources of CP violation allow for significant universality violationconsistent with $R_K \sim 1$. This provides an exciting new opportunity tosearch for New Physics by measuring differences between CP asymmetries in $B\to K\mu^+\mu^-$ and $B \to K e^+e^-$.

New Probes of Electron--Muon Universality in $B \to K\ell^+\ell^-$ Decays