对高重子数密度粒子发射源的干涉学分析
Interferometry for Particle emitting Source of High Baryon Density
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摘要: 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 Twiss，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 pathintegral formulae， we examined the twokaon and twopion HanburyBrownTwiss (HBT) interferometry for the particleemitting source with high baryon density. The evolution of the source is described by relativistic hydrodynamics. We use an equation of state of firstorder transition from QGP to hadronic phase and consider a volume correction for the hadronic gas. The twopion HBT results with effects of excitedparticle decay and multiple scattering were investigated and compared with those for conventional thermal freeze out (TFO) model. We found that the twokaon 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.Abstract: Using quantum pathintegral formulae，we examined the twokaon and twopion HanburyBrownTwiss (HBT) interferometry for the particleemitting source with high baryon density. The evolution of the source is described by relativistic hydrodynamics. We use an equation of state of firstorder transition from QGP to hadronic phase and consider a volume correction for the hadronic gas. The twopion HBT results with effects of excitedparticle decay and multiple scattering were investigated and compared with those for conventional thermal freezeout (TFO) model. We found that the twokaon HBT radius was smaller than those of the twopion 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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