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Paper

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

Abstract

The production of pairs in proton-proton collisions at a centre-of-mass energy of 7 TeV has been observed using an integrated luminosity of collected with the LHCb detector. The production cross-section for pairs with both \jpsi in the rapidity range and transverse momentum is where the first uncertainty is statistical and the second systematic.