Journal
PHYSICAL REVIEW C
Volume 81, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.81.044903
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Funding
- US Department of Energy [DE-AC52-07NA27344]
- National Science Foundation [NSF PHY-0555660]
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The charmonium yields are expected to be considerably suppressed if a deconfined medium is formed in high-energy heavy-ion collisions. In addition, the bottomonium states, with the possible exception of the Gamma(1S) state, are also expected to be suppressed in heavy-ion collisions. However, in proton-nucleus collisions the quarkonium production cross sections, even those of the Gamma(1S), are also suppressed. These cold nuclear matter effects need to be accounted for before signals of the high-density QCD medium can be identified in the measurements made in nucleus-nucleus collisions. We identify two cold nuclear matter effects important for midrapidity quarkonium production: nuclear absorption, typically characterized as a final-state effect on the produced quarkonium state, and shadowing, the modification of the parton densities in nuclei relative to the nucleon, an initial-state effect. In this article, we characterize these effects and study the energy, rapidity, and impact-parameter dependence of initial-state shadowing.
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