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arXiv 1001.2610nucl-th
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颗粒比和QCD临界温度

Particle Ratios and the QCD Critical Temperature

J. Noronha-Hostler, J. Noronha, C. Greiner

摘要:

我们展示了如何在RHIC测得的粒子比可以用来提供非平凡的QCD相变的临界温度的信息。这是通过包括高质量的Hagedorn共振的统计模型,这是用来描述强子产量的影响。Hagedorn态与$T_c$相关,并且已经被证明可以将$η/s$降低到KSS极限,并且在强子的动力学计算中可以快速实现化学平衡。Hagedorn状态的包含创建热拟合对Hagedorn温度$T_H$的依赖性,其被假设为等于$T_c$,并且导致热拟合的总体改善。我们发现,在RHIC的Au+Au碰撞在$\sqrt{s_{NN}}=200$ GeV的最佳平方拟合措施,$χ^2$,发生在$T_c \sim 176$ MeV和产生的化学冻结温度为170.4 MeV和重子化学势为27.8 MeV。

英文摘要:

We show how the measured particle ratios at RHIC can be used to provide non-trivial information about the critical temperature of the QCD phase transition. This is obtained by including the effects of highly massive Hagedorn resonances on statistical models, which are used to describe hadronic yields. Hagedorn states are relevant close to $T_c$ and have been shown to decrease $η/s$ to the KSS limit and allow for quick chemical equilibrium times in dynamical calculations of hadrons. The inclusion of Hagedorn states creates a dependence of the thermal fits on the Hagedorn temperature, $T_H$, which is assumed to be equal to $T_c$, and leads to an overall improvement of thermal fits. We find that for Au+Au collisions at RHIC at $\sqrt{s_{NN}}=200$ GeV the best square fit measure, $χ^2$, occurs at $T_c \sim 176$ MeV and produces a chemical freeze-out temperature of 170.4 MeV and a baryon chemical potential of 27.8 MeV.

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