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arXiv 2109.05098nucl-thhep-phnucl-ex
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沿奇异中性轨迹的峰度的非平衡效应

Off-of-equilibrium effects on Kurtosis Along Strangeness-Neutral Trajectories

Travis Dore, Jamie Karthein, Debora Mroczek, Paolo Parotto, Jacquelyn Noronha-Hostler, Claudia Ratti

摘要:

相对论重离子对撞机(RHIC)的束流能量扫描计划正在寻找QCD临界点。临界点的主要信号是在逐个事件的基础上获得的质子产率分布的峰度,其中人们期望在临界点处达到峰值。然而,它的确切行为仍然是一个悬而未决的问题,由于非平衡效应和状态方程的不确定性。在这里,我们使用一个简单的流体动力学模型,强制执行奇异中性,选择接近临界点的轨迹。我们改变初始条件,以估计的峰度信号上的平衡流体动力学的效果。

英文摘要:

The Beam Energy Scan program at the Relativistic Heavy Ion Collider (RHIC) is searching for the QCD critical point. The main signal for the critical point is the kurtosis of the distribution of proton yields obtained on an event-by-event basis where one expects a peak at the critical point. However, its exact behavior is still an open question due to out-of-equilibrium effects and uncertainty in the equation of state. Here we use a simplistic hydrodynamic model that enforces strangeness-neutrality, selecting trajectories that pass close to the critical point. We vary the initial conditions to estimate the effect of out-of-equilibrium hydrodynamics on the kurtosis signal.

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