A model-independent measurement of the CKM angle γ in partially reconstructed B ± → D * h ± decays with D → K S 0 $$ {K}_S^0 $$ 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.

Keywords

• B Physics
• CKM Angle Gamma
• CP Violation
• Hadron-Hadron Scattering