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 (D0 and D¯ 0 ) states and is reconstructed through the decay chains D∗ → Dπ0/γ and D → K0 Sπ +π −/K0 SK+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+13 −14) ◦ using the measured CP-violating observables. The hadronic parameters r D∗K± B , rD∗π± B , δD∗K± B , δD∗π± B , which are the ratios and strong phase diferences between favoured and suppressed B± decays, are also reported.