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arXiv 1102.2084nucl-thhep-ph
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A+A碰撞中能量密度涨落的演化

Evolution of energy density fluctuations in A+A collisions

M. S. Borysova, Iu. A. Karpenko, Yu. M. Sinyukov

摘要:

在RHIC能量下测量的200 MeV的质量中心的Au+Au碰撞中发射的带电粒子的两粒子角相关揭示了通常被称为近侧脊的新结构。相对论A+A碰撞中的脊现象可能源于系统热演化的初始条件。在这项研究中,我们分析的演变的碰撞横向结构的能量密度分布所造成的初始密度分布的波动,可能会导致脊结构。我们假设在碰撞的初始阶段,初始能量密度分布的典型单粒子结构可以用在某些空间快度区域内助推不变的、相当薄的纵管组来表示。与平滑的背景密度分布相比,这些管具有非常高的能量密度。计算了在不同初始条件下,系统演化到化学冻结(温度T=165 MeV)的不同时刻的横向速度和能量密度分布。

英文摘要:

Two-particle angular correlation for charged particles emitted in Au+Au collisions at the center-of-mass of 200 MeV measured at RHIC energies revealed novel structures commonly referred to as a near-side ridge. The ridge phenomenon in relativistic A+A collisions is rooted probably in the initial conditions of the thermal evolution of the system. In this study we analyze the evolution of the bumping transverse structure of the energy density distribution caused by fluctuations of the initial density distributions that could lead to the ridge structures. We suppose that at very initial stage of collisions the typical one-event structure of the initial energy density profile can be presented as the set of longitudinal tubes, which are boost-invariant in some space-rapidity region and are rather thin. These tubes have very high energy density comparing to smooth background density distribution. The transverse velocity and energy density profiles at different times of the evolution till the chemical freeze-out (at the temperature T=165 MeV) willbe reached by the system are calculated for sundry initial scenarios.

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