Calculating QCD Phase Diagram Trajectories of Nuclear Collisions using a Semi-analytical Model
Calculating QCD Phase Diagram Trajectories of Nuclear Collisions using a Semi-analytical Model
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使用半解析模型计算核碰撞的 QCD 相图轨迹
DOI：
10.1051/epjconf/202327601012
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发表时间：
2023
影响因子：
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通讯作者：
Lin, Zi-Wei
中科院分区：
文献类型：
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作者：
Mendenhall, Todd;Lin, Zi-Wei
在低至中等碰撞能量下，部分子形成时间τf与核穿越时间相比不小，有限核厚度对重离子碰撞产生的能量密度ϵ(T)和净守恒电荷密度(如净重子密度B(T))有显著影响。因此，在中低能量下，QCD相图中的轨迹也受到有限核厚度的影响。在这里，我们首先讨论了我们的半解析模型及其在中心Au+Au碰撞中的ϵ(F)、Nr(T)、Nq(T)和ns(T)的结果。然后，我们比较了用量子统计的理想气体状态方程(EOS)提取的Thet(T)、μB(T)、μQ(T)和μS(T)与用晶格QCD基物态方程提取的Tet(T)、Thet B(T)、Thet(T)和Thet(T)。我们还将Thet-μ轨道与RHIC化学冻结数据进行了比较。最后，我们讨论了横向流动对轨迹的影响。
At low to moderate collision energies where the parton formation time τFis not small compared to the nuclear crossing time, the finite nuclear thickness significantly affects the energy density ϵ(t) and net conserved-charge densities such as the net-baryon densitynB(t) produced in heavy ion collisions. As a result, at low to moderate energies the trajectory in the QCD phase diagram is also affected by the finite nuclear thickness. Here, we first discuss our semi-analytical model and its results on ϵ(f),nR(t),nQ(t), andns(t) in central Au+Au collisions. We then compare theT(t), μB(t), μQ(t), and μS(t) extracted with the ideal gas equation of state (EoS) with quantum statistics to those extracted with a lattice QCD-based EoS. We also compare theT-μBtrajectories with the RHIC chemical freezeout data. Finally, we discuss the effect of transverse flow on the trajectories.