Cold Nuclear Matter Effects on J/psi and Upsilon Production at the LHC

Journal Article · Tue Jun 23 04:00:00 EDT 2009 · Physical Review C, vol. 81, n/a, April 13, 2010, pp. 044903

OSTI ID:983389

Vogt, R

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 {Upsilon}(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 {Upsilon}(1S), scale less than linearly with the number of binary nucleon-nucleon collisions. 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. We characterize these effects and study their energy and rapidity dependence.

• Research Organization: Lawrence Livermore National Laboratory (LLNL), Livermore, CA
• Sponsoring Organization: USDOE
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 983389
• Report Number(s): LLNL-JRNL-414274
• Journal Information: Physical Review C, vol. 81, n/a, April 13, 2010, pp. 044903, Journal Name: Physical Review C, vol. 81, n/a, April 13, 2010, pp. 044903 Vol. 81
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ABSORPTION
BOTTOMONIUM
CHARMONIUM
CROSS SECTIONS
MODIFICATIONS
NUCLEAR MATTER
NUCLEI
PARTICLE RAPIDITY
PRODUCTION
QUANTUM CHROMODYNAMICS
QUARKONIUM