Measurement of the B0–anti-B0 Oscillation Frequency Δmd with the Decays B0 → D− π+ and B0 → J/ψ K∗0

The B0–anti-B0 oscillation frequency Δmd is measured by the LHCb experiment using a dataset corresponding to an integrated luminosity of 1.0 fb^−1 of proton–proton collisions at √s = 7 TeV, and is found to be Δmd = 0.5156 ± 0.0051(stat.) ± 0.0033(syst.) ps^−1. The measurement is based on results from analyses of the decays B0 → D− π+ (D− → K+ π− π−) and B0 → J/ψ K⁎0 (J/ψ → μ+ μ−, K⁎0 → K+ π−) and their charge conjugated modes.