Measurement of the CKM angle γ in the B${}^0$ → D K${}^{\ast 0}$ channel using self-conjugate D → K${}_S^0$h${}^{+}$h${}^{-}$ decays

A model-independent study of CP violation in B${}^0$ → D K${}^{\ast 0}$ decays is presented using data corresponding to an integrated luminosity of 9 fb${}^{-1}$ collected by the LHCb experiment at centre-of-mass energies of $\sqrt{s}$ = 7, 8 and 13 TeV. The CKM angle γ is determined by examining the distributions of signal decays in phase-space bins of the self-conjugate D → K${}_S^0$h${}^{+}$h${}^{-}$ decays, where h = π, K. Observables related to CP violation are measured and the angle γ is determined to be γ = (49${}_{-19}^{+22}$)${}^{\circ }$. Measurements of the amplitude ratio and strong-phase difference between the favoured and suppressed B${}^0$ decays are also presented.