Analysis of ${\Lambda }_b^0\to p{K}^{-}{\mu }^{+}{\mu }^{-}$ decays

The differential branching fraction and angular coefficients of ${\Lambda }_b^0\to p{K}^{-}{\mu }^{+}{\mu }^{-}$ decays are measured in bins of the dimuon mass squared and dihadron mass. The analysis is performed using a data set corresponding to 9${\text{fb}}^{-1}$ of integrated luminosity collected with the $LHCb$ detector between 2011 and 2018. The data are consistent with receiving contributions from a mixture of $\Lambda$ resonances with different spin-parity quantum numbers. The angular coefficients show a pattern of vector-axial vector interference that is a characteristic of the type of flavour-changing neutral-current transition relevant for these decays.