Quarkonium production in an improved color evaporation model

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 quarkoniu...

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Bibliographic Details
Published in:Physical review. D 2016-12, Vol.94 (11), Article 114029
Main Authors: Ma, Yan-Qing, Vogt, Ramona
Format: Article
Language:English
Subjects:
Color
Constraint modelling
Evaporation
Quarks
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Summary: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. 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.
ISSN:2470-0010
2470-0029
DOI:10.1103/PhysRevD.94.114029