J/psi and D Meson Production by Intrinsic Charm

A nonperturbative contribution to charm production, intrinsic charm, has long been speculated, with much contradictory empirical evidence. LHCb recently reported evidence for intrinsic charm in $Z + { m jet}$ events at $sqrt{s} = 13$~TeV. While $J/psi$ production by intrinsic charm would normally only manifest itself outside the range of the LHC detectors, even at forward rapidity, the high $Q^2$ of these events allowed for their detection. On the other hand, at low center of mass energies, $J/psi$ and $D$ meson production by intrinsic charm could manifest itself at midrapidity, as described for the SeaQuest experiment at Fermilab. This talk will explore the rapidity and $p_T$ dependence of an intrinsic charm signature for laboratory beams of 40~GeV and higher, both in $p+p$ and $p+A$ interactions and place the results in context of previous experimental evidence.