Observation of double charm production involving open charm in pp collisions at $\sqrt{s}$=7 TeV

LHCb Collaboration, R. Aaij, C. Abellan Beteta +589

The production of $J/\psi$ mesons accompanied by open charm, and of pairs of open charm hadrons are observed in pp collisions at a centre-of-mass energy of 7 TeV using an integrated l…