NUCLEAR SUPPRESSION OF HADROPRODUCTION

Details NUCLEAR SUPPRESSION OF HADROPRODUCTION NUCLEAR SUPPRESSION OF HADROPRODUCTION

1995-04-27

arxiv.org/abs/nucl-th/9504032v2

Phys.Rev.C53:2401-2409,1996

Physics

Nuclear Physics

Nuclear Theory

19 pages, latex, 12 uuencoded figures

Scientific paper

10.1103/PhysRevC.53.2401

We demonstrate that the main part of the observed nuclear suppression of dilepton and charmonium production, especially the x-dependence of the suppression, can be explained by the absorption of fast initial partons. We assume the absorption to be x1-dependent and determine the empirical form of this dependence. Several reactions at different energies are described with the same parametrization of the absorption cross section. The factorization theorem constraints and some alternative models are discussed. The obtained description of data allows to make conclusions about the origin of nuclear effects in hadro- and electroproduction. In particular, it is concluded that the parton recombination and the excess pion contribution are unimportant in nuclei and an indication of excess gluons at $x_{2}\sim 0.1$ is observed.

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