Double quarkonium production at high Feynman-x

In this paper we give estimates for the proton-proton cross sections into pairs of quarkonium states J/ψ, ψ(2S), ϒ(1S) and ϒ(2S) at the scheduled AFTER@LHC energy of 115 GeV. The estimates are based on the intrinsic heavy quark mechanism which is observable for high values of xF, a range outside the dominance of single parton and double parton scattering.