Observation of $J/\psi$ pair production in pp collisions at $\sqrt{s}=7TeV$

LHCb Collaboration, R. Aaij, B. Adeva +567

The production of $J/\psi$ pairs in proton-proton collisions at a centre-of-mass energy of 7 TeV has been observed using an integrated luminosity of $37.5p{b}^{-1}$ collected with the…