富重子火球流体动力学模型中的光谱和飞秒尺度
Spectra and femtoscopic scales in a hydrokinetic model for baryon-rich fireballs
摘要：
本文将早先提出的RHIC能量的流体动力学模型和动力学冻结方案推广到重子化学势不为零的低碰撞能。在这种情况下，一个新的两相状态方程的重子丰富的强子物质内描述的修改相对论平均场论。作为一个例子，该方法被用来分析实验室能量为40和158 AGeV的Pb+Pb碰撞的π介子和K介子谱和干涉半径。观察到一个很好的协议的横向质量依赖的纵向半径的两种能量的研究。在$E_{lab}=$ 158 AGeV处，横向半径$R_{out}, R_{side}$与实验值吻合，但在$E_{lab}=$ 40 AGeV处，横向半径与实验值相差20%。这种差异在$R_{out}/R_{side}$比值分析中更为明显。然而，考虑的流体动力学模型的应用与状态方程，包括一阶相变的例子是相当成功的，需要进一步发展的模型。
英文摘要：
The hydrokinetic model and the scheme of dynamical freeze out proposed earlier for the RHIC energy are extended to lower colliding energy for non-vanishing baryon chemical potential. In this case a new two-phase equation of state is applied where baryon-rich hadronic matter is described within modified relativistic mean-field theory. As an example, the approach is employed for analyzing pion and kaon spectra and interferometry radii of Pb+Pb collisions at laboratory energies 40 and 158 AGeV. A good agreement is observed for the transverse mass dependence of the longitudinal radius for both energies studied. The transverse radii $R_{out}, R_{side}$ reproduce experiment at $E_{lab}=$158\ AGeV but at $E_{lab}=$40\ AGeV there is a marked (20 \%) difference from experimental points. This discrepancy is more noticeable in analysis of the ratio $R_{out}/R_{side}$. Nevertheless, considered examples of application of the hydrokinetic model with equation of state including the first order phase transition are quite successful and further development of the model is required.
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