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arXiv 1609.01416nucl-thhep-exhep-phnucl-ex
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准粒子模型中的重子数涨落

Baryon Number Fluctuations in Quasi-particle Model

Ameng Zhao, Xiaofeng Luo, Hongshi Zong

摘要:

重子数涨落对QCD相变和QCD临界点很敏感。根据有限温度场论的Feynman规则,计算了夸克-胶子等离子体准粒子模型中重子数分布的各种阶矩和累积量。此外,我们还将所得结果与RHIC STAR实验测量的数据进行了比较。结果表明,该模型能很好地描述30 GeV以上能量的碰撞实验数据,但在低能时,实验数据有较大的偏差。它可以对qQGP模型提出新的约束,也可以为低能重离子碰撞中的QCD临界点搜索提供基线。

英文摘要:

Baryon number fluctuations are sensitive to the QCD phase transition and QCD critical point. According to the Feynman rules of finite-temperature field theory, we calculated various order moments and cumulants of the baryon number distributions in the quasi-particle model of quark gluon plasma. Furthermore, we compared our results with the experimental data measured by the STAR experiment at RHIC. It is found that the experimental data can be well described by the model for the colliding energies above 30 GeV and show large discrepancies at low energies. It can put new constraint on qQGP model and also provide a baseline for the QCD critical point search in heavy-ion collisions at low energies.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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