Addendum: Observation of double charm production involving open charm in pp collisions at √s = 7 TeV

The production of J/ψ mesons accompanied by open charm hadrons, and of pairs of open charm hadrons in pp collisions at a centre-of-mass energy of 7 TeV has been reported in ref. [1].For all measured production cross-sections the inclusion of charge conjugate processes was implied, so that e.g., σ J/ψ D 0 is the sum of production cross-sections for J/ψ D 0 and J/ψ D 0 .The inclusion of charge conjugate states was applied also for the reference inputOpen Access, Copyright CERN, for the benefit of the LHCb Collaboration.Article funded by SCOAP 3 .