Observation of J/ψ pair production in pp collisions at s√=7TeV.

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• The LHCb Collaboration

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Original language English Physics Letters B https://doi.org/10.1016/j.physletb.2011.12.015 Published - 10 Jan 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 37.5pb−1 collected with the LHCb detector. The production cross-section for pairs with both \jpsi in the rapidity range 2&lt;y^{J/\psi}&lt;4.5 and transverse momentum p_{T}^{J/\psi}&lt;10 GeV/c is
σJ/ψJ/ψ=5.1±1.0±1.1nb,
where the first uncertainty is statistical and the second systematic.

ID: 1629956