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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 to be larger than the mass of produced quarkonium.
We also introduce a momentum shift between heavy quark-antiquark pair and the
quarkonium. Numerical calculations show that our model can describe the
charmonium yields as well as ratio of over better than
the traditional color evaporation model.Comment: 6 pages, 4 figure
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