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arXiv 1401.4409nucl-thhep-ph
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在5.02 TeV的p-Pb碰撞中的Parton-Hadron-String-Dynamics输运方法

p-Pb collisions at 5.02 TeV in the Parton-Hadron-String-Dynamics transport approach

V. P. Konchakovski, W. Cassing, V. D. Toneev

备注：
16 pages, 8 figures
发表信息：
J. Phys. G: Nucl. Part. Phys. 41, 105004 (2014)
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摘要：

在$\sqrt{s_{NN}}=$ 5.02 TeV的p-Pb碰撞的Parton-Hadron-String-Dynamics（PHSD）输运模型，并比较最近的实验数据从大型强子对撞机以及替代模型。我们专注于初态动力学的问题，即，如果初始状态可以近似为一个独立的核子-核子碰撞的叠加，或应被视为一个相干胶子场内的颜色玻璃凝聚（CGC）框架内预测。我们发现，PHSD方法提供的带电粒子多重性在midrapidity和参与者的核子接近的结果从CGC的数量之间的相关性，并与独立的Glauber初始条件计算的结果有很大的不同。然而，一个相当大的差异被发现之间的PHSD方法和CGC模型的平均横向动量的快度依赖。因此，大型强子对撞机的相关测量应该能够证明或反驳碰撞初始阶段相干色场的存在。

英文摘要：

The Parton-Hadron-String-Dynamics (PHSD) transport model is employed for p-Pb collisions at $\sqrt{s_{NN}}=$ 5.02 TeV and compared to recent experimental data from the LHC as well as to alternative models. We focus on the question of initial state dynamics, i.e. if the initial state might be approximated by a superposition of independent nucleon-nucleon collisions or should be considered as a coherent gluon field as predicted within the color glass condensate (CGC) framework. We find that the PHSD approach provides correlations between the charged particle multiplicity at midrapidity and the number of participant nucleons close to results from the CGC and differs substantially from results calculated with independent Glauber initial conditions. However, a sizeable difference is found between the PHSD approach and CGC models with respect to the rapidity dependence of the average transverse momentum. Accordingly, related measurements at LHC should allow to prove or disprove the presence of coherent colour fields in the initial phase of the collisions.

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