论文标题
从RHIC束能量扫描到LHC可用的相对论重离子碰撞中的非平衡动力学冻结特性
Nonequilibrium kinetic freeze-out properties in relativistic heavy ion collisions from energies employed at the RHIC beam energy scan to those available at the LHC
论文作者
论文摘要
在本文中，我们研究了不同碰撞能量的相对论重离子碰撞中的动力学冻结特性。我们介绍了一项对标准Boltzmann-Gibbs Blast-Wave（BGBW）的拟合和Tsallis Blast-Wave（TBW）拟合，在Au + Au碰撞碰撞碰撞碰撞碰撞碰撞碰撞时所鉴定的Hadrons的拟合（TBW）拟合。撞机（RHIC），以及在$ \ sqrt {s _ {\ rm {nn}}} = $ 2.76和5.02 TEV的collision Energies collision Energies collision Energies中的撞机（RHIC）和5.02 TEV。还研究了奇怪和多震颤粒子的行为。我们发现，TBW模型比BGBW总体上更好地描述了数据，并且随着发现产生系统的非平衡程度的增加，对比度更为突出。从TBW拟合中，相同中心的动力学冻结温度显示出7.7至39 GEV之间的碰撞能量依赖性弱，而随着碰撞能量继续升高到5.02 TEV，它会降低。发现径向流与RHIC能量处的外周碰撞中的零一致，但在LHC能量和所有RHIC能量的中央碰撞方面相当。我们还观察到，奇怪的哈登子具有较高的温度和相似的径向流动，从外围到中央碰撞的速度比轻载体更快。温度和流速度对非平衡参数（$ q-1 $）的依赖性为两个二阶多项式。从多项式拟合中的$ a $ a $和$dξ$都与系统散装粘度的影响有关，朝着较低的RHIC能量增加。
In this paper, we investigate the kinetic freeze-out properties in relativistic heavy ion collisions at different collision energies. We present a study of standard Boltzmann-Gibbs Blast-Wave (BGBW) fits and Tsallis Blast-Wave (TBW) fits performed on the transverse momentum spectra of identified hadrons produced in Au + Au collisions at collision energies of $\sqrt{s_{\rm{NN}}}=$ 7.7 - 200 GeV at the Relativistic Heavy Ion Collider (RHIC), and in Pb + Pb collisions at collision energies of $\sqrt{s_{\rm{NN}}}=$ 2.76 and 5.02 TeV at the Large Hadron Collider (LHC). The behavior of strange and multi-strange particles is also investigated. We found that the TBW model describes data better than the BGBW one overall, and the contrast is more prominent as the collision energy increases as the degree of non-equilibrium of the produced system is found to increase. From TBW fits, the kinetic freeze-out temperature at the same centrality shows a weak dependence of collision energy between 7.7 and 39 GeV, while it decreases as collision energy continues to increase up to 5.02 TeV. The radial flow is found to be consistent with zero in peripheral collisions at RHIC energies but sizable at LHC energies and central collisions at all RHIC energies. We also observed that the strange hadrons, with higher temperature and similar radial flow, approach equilibrium more quickly from peripheral to central collisions than light hadrons. The dependence of temperature and flow velocity on non-equilibrium parameter ($q-1$) is characterized by two second-order polynomials. Both $a$ and $dξ$ from the polynomials fit, related to the influence of the system bulk viscosity, increase toward lower RHIC energies.
