论文标题
使用半分析模型计算核冲突的QCD相图轨迹
Calculating QCD Phase Diagram Trajectories of Nuclear Collisions using a Semi-analytical Model
论文作者
论文摘要
在低至中度的碰撞能量下，与核交叉时间相比，Parton组形成时间$τ_f$并不小，有限的核厚度显着影响能量密度$ε（T）$和净保留电荷密度，例如Baryon净密度$ N_B（t）$ N_B（T）在重型ION碰撞中产生。结果，在低至中的能量下，QCD相图中的轨迹也受到有限的核厚度的影响。在这里，我们首先讨论了我们的半分析模型及其在$ε（t）$，$ n_b（t）$，$ n_q（t）$和$ n_s（t）$中的结果。然后，我们将$ t（t）$，$μ_b（t）$，$μ_q（t）$和$μ_s（t）$与量子统计的理想气体方程（EOS）提取的$μ___s（t）$与基于lattice QCD的EOS提取的量子统计的人。我们还将$ t-μ_b$轨迹与RHIC Chemical FreezeOut数据进行了比较。最后，我们讨论横向流对轨迹的影响。
At low to moderate collision energies where the parton formation time $τ_F$ is 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 density $n_B(t)$ 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 $ε(t)$, $n_B(t)$, $n_Q(t)$, and $n_S(t)$ in central Au+Au collisions. We then compare the $T(t)$, $μ_B(t)$, $μ_Q(t)$, and $μ_S(t)$ extracted with the ideal gas equation of state (EoS) with quantum statistics to those extracted with a lattice QCD-based EoS. We also compare the $T-μ_B$ trajectories with the RHIC chemical freezeout data. Finally, we discuss the effect of transverse flow on the trajectories.
