A model-independent measurement of the CKM angle γ in partially reconstructed B ^± → D ^*h ^± decays with D → KS0h ⁺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 ^*→ Dπ ⁰ decay is not reconstructed. The D meson is reconstructed in the self-conjugate decay modes, D → K _S ⁰π ⁺π ⁻ or D → K _S ⁰K ⁺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.