Consequences of nuclear shadowing for heavy quarkonium production in hadron-nucleus interactions.

We study nuclear shadowing in J/ψ and Υ production in hadron-nucleus interactions and in nucleus-nucleus collisions at the Relativistic Heavy Ion Collider and the Large Hadron Collider. As a consequence of the perturbative Q2-dependence of gluon shadowing, we predict that Υ production is less suppressed than the J/ψ. We show that antishadowing leads to enhanced J/ψ production at xf ∼ 0, an effect reduced for Υ production. ⋆ This work was supported in part by the Director, Office of Energy Research, Division of Nuclear Physics of the Office of High Energy and Nuclear Physics of the U. S. Department of Energy under Contract Number DE-AC03-76SF0098.