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arXiv 1905.06334hep-ph
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AA和p+p碰撞中的弦渗流

String percolation in AA and p+p collisions

I. Bautista, C. Pajares, J. E. Ramírez

摘要:

简要回顾了串渗流模型及其结果,并与实验数据进行了比较。首先介绍了夸克-胶子相图和关于禁闭和中心畴逾渗的晶格结果。研究了核-核和质子-质子碰撞中产生的弦之间的相互作用,揭示了弦逾渗是如何产生的。通过与实验数据的比较,得到了弦逾渗对能量和中心性、多重数和平均横动量的依赖关系。它强调的非阿贝尔字符的色场的弦形成集群再现的多重性和多重性的相对抑制的横向动量的上升。还研究了不同的可观测量,如多重数和横向动量分布,多重数和横向动量关联的依赖性,向前向后关联,玻色-爱因斯坦关联的强度,$J/Ψ$产生的多重数的依赖性及其在高多重数pp碰撞中可能的抑制,奇异增强,椭圆流和脊结构。与数据的比较表明总体一致。计算了碰撞中扩展团簇的能量密度、熵密度、剪切粘滞系数与熵密度之比、体粘滞系数、声速和径迹反常随温度的变化,讨论了扩展团簇的热力学性质,结果与格点量子色动力学的计算结果一致。弦逾渗可以看作是描述AA和PP碰撞产生的集体行为的初始框架。

英文摘要:

A brief review of the string percolation model and its results are presented together with the comparison to experimental data. First, it is done an introduction to the quark-gluon phase diagram and the lattice results concerning the confinement and the percolation of center domains. It is studied the interaction of the strings produced in nucleus-nucleus and proton-proton collisions showing how the string percolation arises. The main consequences of the string percolation, concerning the dependence on the energy and centrality, on the multiplicities and the mean transverse momentum are obtained comparing with experimental data. It is emphasized the non-abelian character of the color field of the strings forming the cluster to reproduce the rise of the transverse momentum with multiplicity and the relative suppression of multiplicities. It is also studied different observables like multiplicity and transverse momentum distributions, dependence with multiplicity and transverse momentum correlations, forward-backward correlations, the strength of the Bose-Einstein correlations, dependence on the multiplicity of $J/Ψ$ production and its possible suppression in pp collisions at high multiplicity, strangeness enhancement, elliptic flow, and ridge structure. The comparison with the data shows an overall agreement. The thermodynamical properties of the extended cluster formed in the collision are discussed computing its energy and entropy density, shear viscosity over entropy density ratio, bulk viscosity, sound speed and trace anomaly as a function of temperature, showing a remarkable agreement with lattice QCD evaluations. The string percolation can be regarded as the initial frame able to describe the collective behavior produced in AA and pp collisions.

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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