Observation of J/ψ Pair Production in pp Collisions at √s=7 TeV

2012 
Abstract The production of J / ψ pairs in proton–proton collisions at a centre-of-mass energy of 7 TeV has been observed using an integrated luminosity of 37.5 pb −1 collected with the LHCb detector. The production cross-section for pairs with both J / ψ in the rapidity range 2 y J / ψ 4.5 and transverse momentum p T J / ψ 10 GeV / c is σ J / ψ J / ψ = 5.1 ± 1.0 ± 1.1 nb , where the first uncertainty is statistical and the second systematic.
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