Translation of collision geometry fluctuations into momentum anisotropies in relativistic heavy-ion collisions

被引：192

作者：

Qin, Guang-You ^{[1
]}

Petersen, Hannah ^{[1
]}

Bass, Steffen A. ^{[1
]}

Mueller, Berndt ^{[1
]}

机构：

[1] Duke Univ, Dept Phys, Durham, NC 27708 USA

来源：

PHYSICAL REVIEW C | 2010年 / 82卷 / 06期

基金：

美国国家科学基金会;

关键词：

PHASE-TRANSITION; ELLIPTIC FLOW; HYDRODYNAMICS;

D O I：

10.1103/PhysRevC.82.064903

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

We develop a systematic framework for the study of the initial collision geometry fluctuations in relativistic heavy-ion collisions and investigate how they evolve through different stages of the fireball history and translate into final-particle momentum anisotropies. We find in our event-by-event analysis that only the few lowest momentum anisotropy parameters survive after the hydrodynamical evolution of the system. The geometry of the produced medium is found to be affected by the pre-equilibrium evolution of the medium and the thermal smearing of the discretized event-by-event initial conditions, both of which tend to smear out the spatial anisotropies. We find such effects to be more prominent for higher moments than for lower moments. The correlations between odd and even spatial anisotropy parameters during the pre-equilibrium expansion are quantitatively studied and found to be small. Our study provides a theoretical foundation for the understanding of initial-state fluctuations and the collective expansion dynamics in relativistic heavy-ion collisions.

引用

页数：14

共 43 条

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