来自无QCD相变的统一纯强子态方程的\(\sqrt{s_{\rm NN}} = 2.4 - 4.5\) GeV下金金碰撞中的质子集体性
Proton Collectivity in Au+Au Collisions at $\sqrt{s_{\rm NN}}=2.4-4.5$~GeV from a Unified Purely Hadronic EOS without QCD Phase Transition
浏览论文内容
中文总结 AI 辅助
研究\(\sqrt{s_{\rm NN}} = 2.4 - 4.5\) GeV金金碰撞中质子集体性，用纯强子输运模型计算质子流及激发函数，与多组数据比较。发现特定平均场能再现部分数据，4.5 GeV时模型失效，结果为表征核物质和绘制相变区域提供强子基线。
中文摘要 AI 辅助
核态方程（EOS）通常被认为在密度为饱和密度\(\rho_0\)的2至5倍的范围内会软化。我们使用纯强子输运模型计算了\(\sqrt{s_{\rm NN}} = 2.4 - 4.5\) GeV重离子碰撞（HICs）中的质子定向流、侧向流和椭圆流及其激发函数，并与HADES、E895和STAR数据进行比较。我们发现，具有统一不可压缩性\(K_0 = 230\) MeV的动量依赖平均场能定量再现高达4.3 GeV的实验质子流，此时最大密度约为\(5\rho_0\)。然而，在4.5 GeV时，纯强子模型无法再现质子定向流和椭圆流数据，这为HICs中部分子自由度的出现提供了间接证据。我们的结果为表征高密度核物质和绘制强子 - 夸克相变区域提供了强子基线。
英文摘要
The nuclear equation of state (EOS) is generally considered to soften in the density range of $2-5$ times the saturation density $ρ_0$. Using a purely hadronic transport model, we calculate the proton directed, sideward, and elliptic flows and their excitation functions in heavy-ion collisions (HICs) at $\sqrt{s_{\rm NN}}=2.4-4.5$~GeV and compare with the HADES, E895, and STAR data. We find that a momentum-dependent mean field with a unified incompressibility $K_0=230$~MeV quantitatively reproduces the experimental proton flows up to 4.3 GeV, at which the maximum density reaches approximately $5ρ_0$. At 4.5 GeV, however, the pure hadronic model fails to reproduce the proton directed and elliptic flow data, providing circumstantial evidence for the onset of partonic degrees of freedom in HICs. Our results provide a hadronic baseline to characterize the high-density nuclear matter and to map the region of hadron-quark phase transition.
