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arXiv 0901.1430hep-ph
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强子共振气体状态方程与强相互作用物质的phase diagram

Equation of state of hadron resonance gas and the phase diagram of strongly interacting matter

L. M. Satarov, M. N. Dmitriev, I. N. Mishustin

摘要:

在有限温度和重子密度条件下,考虑有限尺寸效应,在排斥体积模型下计算了强子共振气体的物态方程。已知强子的贡献与质量高达2 GeV包括在零宽度近似。特别注意奇异强子在总奇异度为零的系统中的作用。加入一个密度相关的平均场,保证核物质有一个饱和点和一个液-气相变。解精细相由具有最低阶微扰修正的袋模型描述。利用奇异中性约束下的吉布斯条件,找到了相变边界。研究了相图对强子排斥体积和平均场参数化的敏感性。分析了混合相中奇异-反奇异分离的可能性。它表明,在K介子和π介子的多重数比的峰值可以解释沿化学冻结线的奇异逸度的非单调行为。

英文摘要:

The equation of state of hadron resonance gas at finite temperature and baryon density is calculated taking into account finite-size effects within the excluded volume model. Contributions of known hadrons with masses up to 2 GeV are included in the zero-width approximation. Special attention is paid to the role of strange hadrons in the system with zero total strangeness. A density- dependent mean field is added to guarantee that the nuclear matter has a saturation point and a liquid-gas phase transition. The deconfined phase is described by the bag model with lowest order perturbative corrections. The phase transition boundary is found by using the Gibbs conditions with the strangeness neutrality constraint. The sensitivity of the phase diagram to the hadronic excluded volume and to the parametrization of the mean-field is investigated. The possibility of strangeness-antistrangeness separation in the mixed phase is analyzed. It is demonstrated that the peaks in the kaon to pion and lambda to pion multiplicity ratios can be explained by a nonmonotonous behavior of the strangeness fugacity along the chemical freeze-out line.

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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