Cold nuclear matter effects on J/ψ and Γ production at energies available at the CERN Large Hadron Collider (LHC)

被引:136
作者
Vogt, R. [1 ,2 ]
机构
[1] Lawrence Livermore Natl Lab, Livermore, CA 94551 USA
[2] Univ Calif Davis, Dept Phys, Davis, CA 95616 USA
来源
PHYSICAL REVIEW C | 2010年 / 81卷 / 04期
基金
美国国家科学基金会;
关键词
TRANSVERSE-MOMENTUM DEPENDENCE; HEAVY-ION COLLISIONS; DRELL-YAN PRODUCTION; J-PSI PRODUCTION; P(P)OVER-BAR COLLISIONS; PARTON DISTRIBUTIONS; NONLINEAR CORRECTIONS; QUARKONIUM PRODUCTION; CHARM; FACTORIZATION;
D O I
10.1103/PhysRevC.81.044903
中图分类号
O57 [原子核物理学、高能物理学];
学科分类号
070202 ;
摘要
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.
引用
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页数:20
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