Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-10-27
Nucl.Phys.A770:40-56,2006
Physics
High Energy Physics
High Energy Physics - Phenomenology
23 pages, 9 figures
Scientific paper
10.1016/j.nuclphysa.2006.01.017
We consider the J/Psi production in proton (deuteron) -- nucleus collisions at high energies. We argue that the production mechanism in this case is different from that in pp collisions due to gluon saturation in the nucleus and formation of the Color Glass Condensate. At forward rapidities (in the proton fragmentation region), the production of J/Psi is increasingly suppressed both as a function of rapidity and centrality. On the other hand, at backward rapidities at RHIC (in the fragmentation region of the nucleus) the coherent effects lead to a modest enhancement of the production cross section, with the nuclear modification factor R(J/Psi) increasing with centrality. We find that the J/Psi production cross section exhibits at forward rapidities the limiting fragmentation scaling established previously for soft processes; in the energy range studied experimentally, it manifests itself as an approximate "xF scaling".
Kharzeev Dmitri
Tuchin Kirill
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