J-Psi Suppression in Hadron-Nucleus Collisions

Abstract

We examine the production of J/$\Psi$ mesons in high energy hadron-nucleus collisions using models that account for both the initial state modification of parton distributions in nuclei and the final state interaction of the produced $c\bar{c}$ pairs. We show that, at the energies of current fixed target experiments, J/$\Psi$ production through quark-antiquark annihilation gives the largest contribution at $x_F>0.5$, while gluon-gluon fusion dominates the production at smaller $x_F$. The observed J/$\Psi$ suppression at large $x_F$ is directly connected to nuclear shadowing in deeply inelastic scattering. We find that a $6\sim 8$mb $c\bar{c}$-nucleon cross section is needed to explain the data on J/$\Psi$ suppression if a simple incoherent multiple scattering formalism is used for the final state interactions.

24 pages, 9 figures available on request, ISU-NP-93-15, LA-UR-94-784

References in corpus (1)

• Perturbative Gluon Shadowing in Heavy Nuclei

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