球形夸克-胶子等离子体演化源的π干涉学分析(英文)  

Pion Interferometry for Spherical Quark-Gluon Plasma Evolution Sources

作　　者：Efaaf M.J. 张卫宁[1] Khaliliasr M. 金恩培[1] 刘亦铭[1] 

机构地区：[1]哈尔滨工业大学物理系,哈尔滨150006

出　　处：《高能物理与核物理》2005年第1期46-49,共4页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金资助 (10 2 75 0 15 )~~

摘　　要：本文对球形演化的夸克 -胶子等离子体膨胀源进行了 2π干涉学分析 .夸克 -胶子等离子体的演化由相对论流体力学和熵密度的物态方程描述 ,而 2πHanbury Brown Twiss (HBT)关联函数由量子几率振幅的路径积分公式计算 .研究结果表明 ,由 2π干涉学得到的源的空间参量敏感地依赖于π介子发射源的相空间分布 ,源的膨胀速度导致HBT半径变小 。We examine the two-pion interferometry for the expanding sources of spherical quark-gluon plasma evolution. The quark-gluon plasma evolution is described by relativistic hydrodynamics with the equation of state of entropy density. The two-pion Hanbury-Brown-Twiss (HBT) correlation functions are calculated using quantum probability amplitudes in a path-integral formalism. We find the spatial parameter extracted by the two-pion interferometry is sensitive to the phase-space distribution of the pion-emitting source. The expanding velocity of the source leads to a smaller HBT radius and changes the relationship between the HBT radius and the freeze-out temperature.

关 键 词：夸克-胶子等离子体 干涉 Π介子 路径积分 熵密度 物态方程 几率 HBT 发射 参量 

分 类 号：O572.33[理学—粒子物理与原子核物理]