Probing lepton flavour universality with $B^0 \to K^{*0} \tau^+ \tau^-$

Neutral current $b \to s \ell \ell$ processes have long been known to be precise probes of physics beyond the Standard Model. A pattern of anomalies seen in $b \to s \mu^+ \mu^-$ and in $b \to c \tau \nu$ data has hinted at the violation of lepton flavour universality. Effective field theories which attempt to find an explanation for these anomalies predict sizeable enhancements to the rate of $b \to s \tau^+ \tau^-$ currents. We use $pp$ collision data collected by the LHCb detector to estimate a sensitivity of $\mathcal{B}(B^0 \to K^{*0} \tau^+ \tau^-) < 1.5 \times 10^{-3}$ at 95% C.L.