A general effective field theory description of $b\to s{l}^{+}{l}^{-}$ lepton universality ratios

Gino Isidori, Davide Lancierini, Abhijit Mathad +3

We construct an expression for a general lepton flavour universality (LFU) ratio, $R_X$, in $b\to s{l}^{+}{l}^{-}$ decays in terms of a series of hadronic quantities which can be treat…