arXiv 1004.25582010-04-15nucl-th

净重子分布的高阶矩作为QCD临界点的探测

Higher Moments of Net-Baryon Distribution as Probes of QCD Critical Point

Y. Zhou, S. S. Shi, K. Xiao, K. J. Wu, F. Liu

备注：: 5 pages, 5 figures
发表信息：: Phys.Rev.C82:014905,2010
DOI：: 10.1103/PhysRevC.82.014905

摘要：

为了寻找QCD预言的可能临界点，寻找一个与接受和后期碰撞过程无关的可观测量是至关重要的。利用多相输运（AMPT）模型和超相对论量子分子动力学（UrQMD）模型，研究了$\sqrt{s_{NN}}=17.3$ GeV Au + Au碰撞中净重子分布高次矩的中心性和演化随时间的变化.结果表明，峰度和偏度对接受效应和后期碰撞过程不太敏感。因此，它们应该是提供重离子碰撞早期信息的良好观测量。此外，我们的研究还表明，当碰撞能量低于$\sqrt{s_{NN}}$ = 20 GeV时，净质子分布的峰度与净重子分布的峰度有很大的不同，峰度$\cdotσ^{2}$的Monte Calor计算与理论预测有偏差.

英文摘要：

It is crucially important to find an observable which is independent on the acceptance and late collision process, in order to search for the possible Critical Point predicted by QCD. By utilizing A Multi-Phase Transport (AMPT) model and Ultra Relativistic Quantum Molecular Dynamics (UrQMD) model, we study the centrality and evolution time dependence of higher moments of net-baryon distribution in Au + Au collisions at $\sqrt{s_{NN}}=17.3$ GeV. The results suggest that Kurtosis and Skewness are less sensitive to the acceptance effect and late collision process. Thus, they should be good observables providing the information of the early stage of heavy ion collision. In addition, our study shows that the Kurtosis times $σ^{2}$ of net-proton distribution are quite different to that of net-baryon when collisions energy is lower than $\sqrt{s_{NN}}$ = 20 GeV, the Monte Calor calculations on Kurtosis$\cdotσ^{2}$ have a deviation from the theoretical predictions.

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