Search for the lepton-flavour violating decay D 0 → e ± μ ∓

Search for the lepton-flavour violating decay D0 → e±μ∓ A search for the lepton-flavour violating decay D0 → e±μ∓ is made with a dataset corresponding to an integrated luminosity of 3.0 fb−1 of proton–proton collisions at centre-of-mass energies of 7 TeV and 8 TeV, collected by the LHCb experiment. Candidate D0 mesons are selected using the decay D∗+ → D0π+ and the D0 → e±μ∓ branching fraction is measured using the decay mode D0 → K−π+ as a normalization channel. No significant excess of D0 → e±μ∓ candidates over the expected background is seen, and a limit is set on the branching fraction, ?(D0 → e±μ∓)