论文标题
Au+Au对在2-5核饱和密度下状态的对称核物质方程的敏感性
Sensitivity of Au+Au collisions to the symmetric nuclear matter equation of state at 2 -- 5 nuclear saturation densities
论文作者
论文摘要
我们证明，在固定目标框架中，在固定目标框架中的每核1至20 GEV处的重离子碰撞中的质子和锥形流量测量值可用于准确确定Baryon密度的对称状态的对称核问题等于2--4倍核饱和密度$ N_0 $的2--4倍。我们使用具有可调矢量平均场电位的HADRONIC传输模型在这些能量上模拟AU+AU碰撞，取决于baryon密度$ n_b $。我们表明，可以将平均场进行参数化以重现零温度下声速的给定密度依赖性$ c_s^2（n_b，t = 0）$，我们在多密度间隔中独立地变化，以探测这些特定密度在这些特定密度处的重型离子观测值对状态方程的差异敏感性。恒星实验的最新流量数据$ \ sqrt {s_ {s_ {nn}} = \ {3.0，4.5 \} \ $ gev可以通过我们的模型来描述，并且对这些数据的贝叶斯分析表明，这些数据表明在$ n_b \ in（2,3）$ n_0 $ n_b \ in $ n_0 $ n_b in的硬性方程式（3） N_0 $。 $ \ sqrt {s_ {nn}} = 2-5 $ gev的更多数据以及对模型系统不确定性的更彻底的分析是更加精确的结论。
We demonstrate that proton and pion flow measurements in heavy-ion collisions at incident energies ranging from 1 to 20 GeV per nucleon in the fixed target frame can be used for an accurate determination of the symmetric nuclear matter equation of state at baryon densities equal 2--4 times nuclear saturation density $n_0$. We simulate Au+Au collisions at these energies using a hadronic transport model with an adjustable vector mean-field potential dependent on baryon density $n_B$. We show that the mean field can be parametrized to reproduce a given density-dependence of the speed of sound at zero temperature $c_s^2(n_B, T = 0)$, which we vary independently in multiple density intervals to probe the differential sensitivity of heavy-ion observables to the equation of state at these specific densities. Recent flow data from the STAR experiment at the center-of-mass energies $\sqrt{s_{NN}} = \{3.0, 4.5 \}\ $ GeV can be described by our model, and a Bayesian analysis of these data indicates a hard equation of state at $n_B \in (2,3) n_0$ and a possible phase transition at $n_B \in (3,4) n_0$. More data at $\sqrt{s_{NN}} = 2-5$ GeV, as well as a more thorough analysis of the model systematic uncertainties will be necessary for a more precise conclusion.
