Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-02-13
Physics
High Energy Physics
High Energy Physics - Phenomenology
6 pages in Latex + 1 figure in ps, to be published in the proceedings of ISMD2000, held in Tihany, Hungary, Oct 2000
Scientific paper
The gluon distribution of a nucleon propagating through a nucleus can change depending on how far the penetration depth is. It is a nonperturbative process that we describe by an evolution equation. The kernel of the integral equation is to be determined by a phenomenological study of J/psi suppression in pA collision. The data of E866 on alpha(x_F) shows significant dependence on x_F at large x_F. It presents a feature that has not been explained by any hadronic absorption model. We show that gluon depletion is a simple mechanism that can account for it. The result has far-reaching implications on the role of partons in nuclear collisions.
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