Model-Independent Measurement of the CKM Angle γ Using B0 → D K∗0 Decays with D → K0S π+ π− and K0S K+ K−

A binned Dalitz plot analysis of the decays B0 → D K∗0, with D → K0S π+ π− and D → K0S K+ K−, is performed to measure the observables x± and y±, which are related to the CKM angle γ and the hadronic parameters of the decays. The D decay strong phase variation over the Dalitz plot is taken from measurements performed at the CLEO-c experiment, making the analysis independent of the D decay model. With a sample of proton-proton collision data, corresponding to an integrated luminosity of 3.0 fb^−1, collected by the LHCb experiment, the values of the CP violation parameters are found to be x+ = 0.05 ± 0.35 ± 0.02, x− = −0.31 ± 0.20 ± 0.04, y+ = −0.81 ± 0.28 ± 0.06 and y− = 0.31 ± 0.21 ± 0.05, where the first uncertainties are statistical and the second systematic. These observables correspond to values γ = (71 ± 20)°, r_B0 = 0.56 ± 0.17 and δ_B0 = (204{−20}{+21})∘ The parameters r_B0 and δ_B0 are the magnitude ratio and strong phase difference between the suppressed and favoured B0 decay amplitudes, and have been measured in a region of ±50 MeV/c^2 around the K∗(892)0 mass and with the magnitude of the cosine of the K∗(892)0 helicity angle larger than 0.4.