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Boltzmann-Langevin approach to pre-equilibrium correlations in nuclear collisions

机译:Boltzmann-langevin核碰撞中的预平衡相关方法

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Correlations born before the onset of hydrodynamic flow can leave observable traces on the final-state particles. Measurement of these correlations yield important information on the isotropization and thermalization processes. Starting from a Boltzmann-like kinetic theory in the presence of dynamic Langevin noise, we derive a new partial differential equation for the two-particle correlation function that respects the microscopic conservation laws. To illustrate how these equations can be used, we study the effect of thermalization on long-range correlations. We show quite generally that two-particle correlations at early times depend on S, the average probability that a parton suffers no interactions. We extract S from transverse momentum fluctuations measured in nucleus-nucleus collisions and predict the degree of partial thermalization in proton-nucleus experiments.
机译:在流体动力流动开始前出生的相关性可以在最终状态颗粒上留出可观察的痕迹。 测量这些相关性会产生关于各等级化和热化过程的重要信息。 从Boltzmann的动态理论开始在动态Langevin噪声存在下,我们推导出一种尊重微观保护法的双粒子相关函数的新的局部微分方程。 为了说明如何使用这些等式,我们研究热化对远程相关的影响。 我们始终表明,早期的两个粒子相关性取决于S,Parton没有相互作用的平均概率。 我们从核 - 核碰撞中测量的横向动量波动提取S并预测质子核实验中的部分热化程度。

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