Quarkonium production in an improved color evaporation model

被引：86

作者：

Ma, Yan-Qing ^{[1
,2
,3
,4
]}

Vogt, Ramona ^{[5
,6
]}

机构：

[1] Peking Univ, Sch Phys, Beijing 100871, Peoples R China

[2] Peking Univ, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R China

[3] Peking Univ, Ctr High Energy Phys, Beijing 100871, Peoples R China

[4] Collaborat Innovat Ctr Quantum Matter, Beijing 100871, Peoples R China

[5] Lawrence Livermore Natl Lab, Nucl & Chem Sci Div, Livermore, CA 94551 USA

[6] Univ Calif Davis, Dept Phys, Davis, CA 95616 USA

来源：

PHYSICAL REVIEW D | 2016年 / 94卷 / 11期

关键词：

HADRONIC PRODUCTION; COLLISIONS; HADROPRODUCTION;

D O I：

10.1103/PhysRevD.94.114029

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 psi' over J/psi better than the traditional color evaporation model.

引用

页数：6

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