Intrinsic charm contribution to Jψ plus open charm associate hadroproduction at high energies

We present the results of a calculation of the intrinsic charm quark contribution to Jψ plus open charm associated production at large transverse momentum in hadron collisions at high energies. It is shown that the value of the cross section for such process and its energy dependence significantly determine by the choice of charm quark distribution function. We found that intrinsic charm contribution to inclusive Jψ hadroproduction at high energies is about several per cent of the total contribution of all mechanisms.