AI 中文总结
该研究在非平衡手征流体动力学中，以低能双轻子为探针，区分强子再散射与QCD物态方程一阶相变的动力学效应，实现两种相情景的明确区分。
AI 中文摘要
我们在非平衡手征流体动力学中研究双轻子发射作为QCD物态方程（EoS）和相结构的探针，比较质心系能量√s_NN=2.20至6.20 GeV下的一阶相变与交叉过渡情景。介质中的ρ和ω谱函数由与π介子及核子的共振驱动前向散射计算得出，由此可区分强子介质展宽与一阶相变动力学诱导的额外修正。相变情景在与EoS软化起始相关的极点质量区域产生早期增强，而低质量连续谱则在后期演化中因 reheating（再加热）和火球延长寿命而显著增强。两种信号在整个演化积分后仍可识别，且在低束能下能明确区分相变与交叉过渡情景。
英文摘要
We investigate low-mass dilepton emission as a probe of the QCD equation of state and phase structure within non-equilibrium chiral fluid dynamics, comparing first-order phase-transition and crossover scenarios at $\sqrt{s_{\rm NN}}=2.20-6.20$~GeV. To disentangle effects of the macroscopic equation-of-state dynamics from conventional hadronic in-medium modifications, the $ρ$ and $ω$ meson self-energies are calculated from the same resonance-driven forward-scattering amplitudes in both scenarios. We find two temporally distinct signatures of the first-order phase transition: an early enhancement in the vector-meson pole region associated with the non-equilibrium evolution through the phase transition, and a later enhancement of the low-mass continuum driven by reheating and the prolonged fireball evolution. Both effects survive integration over the complete space-time evolution, with the pole-mass region retaining the strongest sensitivity to the phase structure. Across the investigated beam energies, the pole-mass excitation function retains a pronounced sensitivity to first-order transition dynamics at low collision energies, identifying this mass region as a promising target for future dilepton beam-energy scans.
Comments13 pages, 8 figures
