The B0–B0 oscillation frequency md 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
md = 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.