skip to main content


Title: Quarkonium production in an improved color evaporation model

In this paper, we propose an improved version of the color evaporation model to describe heavy quarkonium production. In contrast to the traditional color evaporation model, we impose the constraint that the invariant mass of the intermediate heavy quark-antiquark pair be larger than the mass of produced quarkonium. We also introduce a momentum shift between the heavy quark-antiquark pair and the quarkonium. Finally, numerical calculations show that our model can describe the charmonium yields as well as the ratio of ψ' over J/ψ better than the traditional color evaporation model.
 [1] ;  [2]
  1. Peking Univ., Beijing (China). School of Physics. State Key Lab. of Nuclear Physics and Technology. Center for High Energy Physics; Collaborative Innovation Center of Quantum Matter, Beijing (China)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Nuclear and Chemical Sciences Division; Univ. of California, Davis, CA (United States). Physics Dept.
Publication Date:
Report Number(s):
Journal ID: ISSN 2470-0010
Grant/Contract Number:
AC52-07NA27344; SC0004014
Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 94; Journal Issue: 11; Journal ID: ISSN 2470-0010
American Physical Society (APS)
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; quark-gluon plasma; exotic baryons; exotic mesons
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1338113