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arXiv 1306.0994nucl-thhep-ph
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相对论性重离子碰撞中的相演化和冻结

Phase Evolution and Freeze-out within Alternative Scenarios of Relativistic Heavy-Ion Collisions

Yu. B. Ivanov

摘要:

在2.7 GeV $\le \sqrt{s_{NN}}\le$ 39 GeV的入射能量范围内,分析了重核相对论碰撞中物质的全局演化和由此产生的全局冻结参数.分析是在三流体模型中采用三种不同的状态方程(EoS):一个纯粹的强子EoS,一个EoS与一阶相变和一个平滑的交叉过渡。从统计模型中的实验数据推导出的全球冻结参数在交叉方案中得到了很好的再现。第一阶过渡方案稍微不太成功。最坏的复制是在纯强子的情况下。这些发现使EoS和统计模型的结果之间的联系,并表明,解除禁闭发生在$\sqrt{s_{NN}}\gsim$ 5 GeV。

英文摘要:

Global evolution of the matter in relativistic collisions of heavy nuclei and the resulting global freeze-out parameters are analyzed in a wide range of incident energies 2.7 GeV $\le \sqrt{s_{NN}}\le$ 39 GeV. The analysis is performed within the three-fluid model employing three different equations of state (EoS): a purely hadronic EoS, an EoS with the first-order phase transition and that with a smooth crossover transition. Global freeze-out parameters deduced from experimental data within the statistical model are well reproduced within the crossover scenario. The 1st-order-transition scenario is slightly less successful. The worst reproduction is found within the purely hadronic scenario. These findings make a link between the EoS and results of the statistical model, and indicate that deconfinement onset occurs at $\sqrt{s_{NN}}\gsim$ 5 GeV.

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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