Measurement of the CKM angle γ using the B ± → D * h ± channels

Abstract A measurement of the CP-violating observables from B ± → D * K ± and B ± → D * π ± decays is presented, where D *(D) is an admixture of D *0 and D ¯ ∗ 0 $$ {\overline{D}}^{\ast 0} $$ (D 0 and D ¯ 0 $$ {\overline{D}}^0 $$ ) states and is reconstructed through the decay chains D * → Dπ 0 /γ and D → K S 0 π + π − / K S 0 K + K − $$ D\to {K}_S^0{\pi}^{+}{\pi}^{-}/{K}_S^0{K}^{+}{K}^{-} $$ . The measurement is performed by analysing the signal yield variation across the D decay phase space and is independent of any amplitude model. The data sample used was collected by the LHCb experiment in proton-proton collisions and corresponds to a total integrated luminosity of 9 fb −1 at centre-of-mass energies of 7, 8 and 13 TeV. The CKM angle γ is determined to be 69 − 14 + 13 ∘ $$ {\left({69}_{-14}^{+13}\right)}^{\circ } $$ using the measured CP-violating observables. The hadronic parameters r B D ∗ K ± , r B D ∗ π ± , δ B D ∗ K ± , δ B D ∗ π ± $$ {r}_B^{D^{\ast }{K}^{\pm }},{r}_B^{D^{\ast }{\pi}^{\pm }},{\delta}_B^{D^{\ast }{K}^{\pm }},{\delta}_B^{D^{\ast }{\pi}^{\pm }} $$ , which are the ratios and strong phase differences between favoured and suppressed B ± decays, are also reported.