Double quarkonium production at high Feynman-x

In this paper we give estimates for the proton–proton cross sections into pairs of quarkonium states $J/\psi$, $\psi \left(2S\right)$, $\Upsilon \left(1S\right)$ and $\Upsilon \left(2S\right)$ at the scheduled [email protected] energy of 115 GeV. The estimates are based on the intrinsic heavy quark mechanism which is observable for high values of $x_F$, a range outside the dominance of single parton and double parton scattering.