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)

Abstract

Abstract 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 → $${K}_S^0$$ K S 0 π+π− or D → $${K}_S^0$$ 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 = ($${92}_{-17}^{+21}$$ 92 − 17 + 21 )°. The total uncertainty includes the statistical and systematic uncertainties, and the uncertainty due to external strong-phase inputs.</jats:p