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

Abstract

[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 ¯D0) states and is reconstructed through the decay chains D∗ → Dπ0/γ and D → K0S π+π−/K0S 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 13TeV. The CKM angle γ is determined to be (69+13 −14)◦ using the measured CP-violating observables. The hadronic parameters rD∗K± B , rD∗π± B , δD∗K± B , δD∗π± B , which are the ratios and strong phase differences between favoured and suppressed B± decays, are also reported.