Heavy quark pair production in high energy pA collisions: Quarkonium

Understand

Quarkonium production in high-energy proton (deuteron)-nucleus collisions is investigated in the color glass condensate framework.

• We employ the color evaporation model assuming that the quark pair produced from dense small-x gluons in the nuclear target bounds into a quarkonium outside the target.
• The unintegrated gluon distribution at small Bjorken x in the nuclear target is treated with the Balitsky-Kovchegov equation with running coupling corrections.
• For the gluons in the proton, we examine two possible descriptions, unintegrated gluon distribution and ordinary collinear gluon distribution.