Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-09-26
Phys.Lett.B680:50-55,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
7 pages, 11 figures, LaTeX, uses elsarticle.cls (included).v2: version (with minor text revisions and Fig 2 and 4a modified) t
Scientific paper
10.1016/j.physletb.2009.07.076
Cold nuclear matter effects on J/psi production in proton-nucleus and nucleus-nucleus collisions are evaluated taking into account the specific J/psi production kinematics at the partonic level, the shadowing of the initial parton distributions and the absorption in the nuclear matter. We consider two different parton processes for the c-cbar pair production: one with collinear gluons and a recoiling gluon in the final state and the other with initial gluons carrying intrinsic transverse momentum. Our results are compared to RHIC observables. The smaller values of the nuclear modification factor R_AA in the forward rapidity region (with respect to the mid rapidity region) are partially explained, therefore potentially reducing the need for recombination effects.
Ferreiro Elena G.
Fleuret François
Lansberg Jean-Philippe
Rakotozafindrabe A.
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