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arXiv 1107.5485nucl-thhep-phhep-th
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理解重离子碰撞中涨落产生的各向异性

Understanding anisotropy generated by fluctuations in heavy-ion collisions

Rajeev S. Bhalerao, Matthew Luzum, Jean-Yves Ollitrault

摘要:

逐事件涨落是当前理解超相对论性重离子碰撞的核心。特别是,早期碰撞系统几何形状的波动是三角流等新现象的原因,这些新现象解决了现有数据中的重要难题。我们提出了一个简单的模型,其中初始波动源于随机分布在横向平面上的独立通量管。我们计算分析的时刻的初始各向异性(偶极不对称,偏心率,三角形),这是各向异性流的来源,和它们的相互关联。我们的分析结果是在良好的协议,从常用的蒙特卡罗程序的计算,提供了一个简单的理解,这些模型中包含的波动。因此,在未来的实验数据中,与这些结果的任何偏差都将表明初始通量管和/或当前模型中不存在的额外波动源之间存在非平凡的相关性。

英文摘要:

Event-by-event fluctuations are central to the current understanding of ultrarelativistic heavy-ion collisions. In particular, fluctuations in the geometry of the early-time collision system are responsible for new phenomena such as triangular flow, which have solved important puzzles in existing data. We propose a simple model where initial fluctuations stem from independent flux tubes randomly distributed in the transverse plane. We calculate analytically the moments of the initial anisotropies (dipole asymmetry, eccentricity, triangularity), which are the sources of anisotropic flow, and their mutual correlations. Our analytic results are in good agreement with calculations from commonly-used Monte-Carlo codes, providing a simple understanding of the fluctuations contained in these models. Any deviation from these results in future experimental data would thus indicate the presence of non-trivial correlations between the initial flux tubes and/or extra sources of fluctuations that are not present in current models.

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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