RHIC能区Au+Au碰撞中HBT关联参数分析(英文)

HBT Parameters for Au+Au Collisions at RHIC Energy

利用相对论量子分子动力学模型RQMD ,对RHIC能区s =2 0 0GeV/uAu +Au碰撞进行了 2π干涉学分析 ,并讨论了HBT半径参数对横动量的依赖关系 .研究表明 ,两粒子关联函数能够给出碰撞源在冻结时刻的时空拓扑信息 ,HBT半径参数能够较好地反映源的尺度和形状 ,但其对横动量的依赖关系并不能直接反映源的压缩性质 ,而是对粒子产生时源的空间

Using the dynamical transport approach RQMD with a correlation afterburner,the behavior of two-pion HBT parameters is studied for Au+Au collisions at RHIC energy s200GeV/u. We find that the HBT size parameters do reflect the source geometry at freeze-out for both central and non-central collisions. The transverse momentum dependence of HBT size parameters is insensitive to the pressure developed during the early stage of the collisions,rather,it is sensitive to the degree of spacemomentum correlation.