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arXiv 1002.0649nucl-exhep-exnucl-th
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超相对论性重离子碰撞中初始碰撞几何模型的约束条件

Constraints on models for the initial collision geometry in ultra relativistic heavy ion collisions

Roy A. Lacey, Rui Wei, N. N. Ajitanand, J. M. Alexander, X. Gong, J. Jia, A. Taranenko, R. Pak, Horst Stocker

备注：
4 pages, 3 figs - version accepted for publication
发表信息：
Phys.Rev.C81:061901,2010
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摘要：

用蒙特卡罗（MC）模拟方法计算了球形和形变基态核的碰撞区偏心率（$ε_{2,4}$）对不同模型的中心依赖性。观察到相当大的模型依赖性差异。他们指出，$2^{\text{nd}}$和$4^{\text{th}}$阶傅立叶流量系数$v_{2,4}$的测量，表示为比率$\frac{v_4}{(v_2)^2}$，可以提供强大的约束条件，区分不同的理论模型的初始状态偏心。这样的限制可以消除一个最大的障碍，以更精确地确定比粘度的精确$v_{2,4}$测量在相对论重离子对撞机（RHIC）。

英文摘要：

Monte Carlo (MC) simulations are used to compute the centrality dependence of the collision zone eccentricities ($ε_{2,4}$), for both spherical and deformed ground state nuclei, for different model scenarios. Sizable model dependent differences are observed. They indicate that measurements of the $2^{\text{nd}}$ and $4^{\text{th}}$ order Fourier flow coefficients $v_{2,4}$, expressed as the ratio $\frac{v_4}{(v_2)^2}$, can provide robust constraints for distinguishing between different theoretical models for the initial-state eccentricity. Such constraints could remove one of the largest impediments to a more precise determination of the specific viscosity from precision $v_{2,4}$ measurements at the Relativistic Heavy Ion Collider (RHIC).

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