A model-independent measurement of the CKM angle γ in partially reconstructed B^± → D^*h^± decays with D → KS0h⁺h⁻ (h = π, K)

Abstract

Abstract A measurement of CP-violating observables in B± → DK± and B± → Dπ± 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.