arXiv 0812.11862008-12nucl-th

相对论核碰撞中的热强子产生：强子质谱、角和QCD相变

Thermal hadron production in relativistic nuclear collisions: the hadron mass spectrum, the horn, and the QCD phase transition

A. Andronic, P. Braun-Munzinger, J. Stachel

备注：: 9 pages, 4 figures, accepted in Phys. Lett. B (v2: estimate of possible effects of higher mass resonances, correction in Fig.1, ref. added; v3: typo in Eq.(1) corrected)
发表信息：: Phys.Lett.B673:142-145,2009; Erratum-ibid.B678:516,2009
DOI：: 10.1016/j.physletb.2009.02.014 10.1016/j.physletb.2009.06.021

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摘要：

本文利用统计模型对重核中心碰撞中的强子产生进行了新的分析。这项研究的动机是最终测量的SPS（光束能量20-160 AGeV）和RHIC能量（$\sqrt{s_{NN}}$ =130和200 GeV）的可用性和强子质谱的更新，这是统计模型的关键输入。扩展以前的研究，包括非常高的质量共振（m> 2 GeV），到目前为止被忽视的标量$σ$介子导致改进的数据描述。特别是，迄今为止很难再现的SPS能量（“角”）的$K^+/π^+$比的能量依赖性，现在很好地描述了通过连接到强子质谱，并隐含，哈格多恩的极限温度。我们由此证明了喇叭和QCD相变之间的密切联系。

英文摘要：

We present, using the statistical model, a new analysis of hadron production in central collisions of heavy nuclei. This study is motivated by the availability of final measurements both for the SPS (beam energies 20-160 AGeV) and for the RHIC energies ($\sqrt{s_{NN}}$=130 and 200 GeV) and by updates in the hadron mass spectrum, which is a crucial input for statistical models. Extending previous studies by inclusion of very high-mass resonances (m> 2 GeV), and the up-to-now neglected scalar $σ$ meson leads to an improved description of the data. In particular, the hitherto poorly reproduced energy dependence of the $K^+/π^+$ ratio at SPS energies ("the horn") is now well described through the connection to the hadronic mass spectrum and, implicitly, Hagedorn's limiting temperature. We thereby demonstrate the intimate connection between the horn and the QCD phase transition.

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