应用量子路径积分的方法,分析了高能重离子碰撞产生的高重子数密度粒子发射源的2K和2π干涉学(Hanbury-Brown-Fwiss,HBT关联).利用相对论流体动力学描述源的演化,采用的状态方程包含QGP到强子相的一级相变和对强子气体的体积修正.在2π关联的计算中考虑了激发态粒子衰变和多重散射效应,并将其HBT关联半径和寿命与传统热冻结模型的结果进行了对比.计算表明,早期化学冻结产生的K介子的HBT关联半径比2π关联的HBT关联半径小.激发态粒子的衰变使HBT关联半径和寿命增加,而多重散射对HBT关联的结果几乎没有影响.
Using quantum path-integral formulae, we examined the two-kaon and two-pion Hanbury-Brown-Twiss (HBT) interferometry for the particle-emitting source with high baryon density. The evolution of the source is described by relativistic hydrodynamics. We use an equation of state of first-order transition from QGP to hadronic phase and consider a volume correction for the hadronic gas. The two-pion HBT results with effects of excited-particle decay and multiple scattering were investigated and compared with those for conventional thermal freeze-out (TFO) model. We found that the two-kaon HBT radius was smaller than those of the two-pion interferometry. The particle decay increases the HBT radius and lifetime, while the effect of multiple scattering on HBT results can be neglected.
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