A Model-Independent Measurement of the CKM Angle Γ in Partially Reconstructed B ± → D * H ± Decays with D → K_S^0 H + H − ( H = Π , K )

A measurement of CP-violating observables in B± → D*K± and B± → D*π± decays is made where the photon or neutral pion from the D* → Dγ or D* → Dπ0 decay is not reconstructed. The D meson is reconstructed in the self-conjugate decay modes, D → K_S^0 π+π− or D → K_S^0 K+K−. The distribution of signal yields in the D decay phase space is analysed in a model-independent way. The measurement uses a data sample collected in proton-proton collisions at centre-of-mass energies of 7, 8, and 13 TeV, corresponding to a total integrated luminosity of approximately 9 fb−1. The B± → D*K± and B± → D*π± CP-violating observables are interpreted in terms of hadronic parameters and the CKM angle γ, resulting in a measurement of γ = ( 92_-17^+21 )°. The total uncertainty includes the statistical and systematic uncertainties, and the uncertainty due to external strong-phase inputs.