A new rapidity regulator for CGC factorization yields an NLO cross section for pA single hadron production that stays positive and has reduced scale uncertainty.
Heavy quark pair production in high energy pA collisions: Quarkonium
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abstract
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. We present the transverse momentum spectrum and nuclear modification factor for J/psi production at RHIC and LHC energies, and those for Upsilon(1S) at LHC energy, and discuss the nuclear modification factor and the momentum broadening by changing the rapidity and the initial saturation scale.
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Improvement for Color Glass Condensate factorization: single hadron production in pA collisions at next-to-leading order
A new rapidity regulator for CGC factorization yields an NLO cross section for pA single hadron production that stays positive and has reduced scale uncertainty.