Two-pion interferometry in heavy ion collisionsat HIRFL-CSR energy  

作　　者：于莉莉 吉日木图 张卫宁 霍雷 张景波 

机构地区：[1]Department of Physics, Harbin Institute of Technology [2]School of Physics and Optoelectronic Technology, Dalian University of Technology [3]Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator of Lanzhou

出　　处：《Chinese Physics C》2008年第11期897-902,共6页中国物理C（英文版）

基　　金：Supported by National Natural Science Foundation of China (10575024,10775024)

摘　　要：We examine the two-pion Hanbury-Brown-Twiss （HBT） interferometry for the particle-emitting source produced in heavy ion collisions at HIRFL-CSR energy. The source evolution is described by relativistic hydrodynamics with three kinds of equations of state for chemical equilibrium （CE）, chemical freeze-out （CFO）, and partial chemical equilibrium （PCE） models, respectively. We investigate the effects of particle decay, multiple scattering, and source collective expansion on the two-pion interferometry results. We find that the HBT radii of the evolution source for the CFO and PCE The HBT lifetime for the CFO model is smaller than those models are smaller than that for the CE model. for the PCE and CE models. The particle decay increases the HBT radius and lifetime while the source expansion decreases the HBT radius. The multiple scattering effect on the HBT results can be neglected based on our model calculations.We examine the two-pion Hanbury-Brown-Twiss （HBT） interferometry for the particle-emitting source produced in heavy ion collisions at HIRFL-CSR energy. The source evolution is described by relativistic hydrodynamics with three kinds of equations of state for chemical equilibrium （CE）, chemical freeze-out （CFO）, and partial chemical equilibrium （PCE） models, respectively. We investigate the effects of particle decay, multiple scattering, and source collective expansion on the two-pion interferometry results. We find that the HBT radii of the evolution source for the CFO and PCE The HBT lifetime for the CFO model is smaller than those models are smaller than that for the CE model. for the PCE and CE models. The particle decay increases the HBT radius and lifetime while the source expansion decreases the HBT radius. The multiple scattering effect on the HBT results can be neglected based on our model calculations.

关 键 词：two-pion interferometry HIRFL-CSR energy particle decay multiple scattering 

分 类 号：O571.6[理学—粒子物理与原子核物理]