Double-quarkonium production at a fixed-target experiment at the LHC (AFTER@LHC)

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We present predictions for double-quarkonium production in the kinematical region relevant for the proposed fixed-target experiment using the LHC beams (dubbed as AFTER@LHC). These include all spin-triplet S -wave charmonium and bottomonium pairs, i.e. Psi(n₁S) + Psi(n₂S), Psi(n₁S) + Upsilon(m₁S) and Upsilon(m₁S) + Upsilon(m₂S) with n₁,n₂ = 1,2 and m₁,m₂ = 1,2,3. We calculate the contributions from double-parton scatterings and single-parton scatterings. With an integrated luminosity of 20 fb-1 to be collected at AFTER@LHC, we find that the yields for double-charmonium production are large enough for differential distribution measurements. We discuss some differential distributions for J/Psi + J/Psi production, which can help to study the physics of double-parton and single-parton scatterings in a new energy range and which might also be sensitive to double intrinsic c-bar(c) coalescence at large negative Feynman x.