摘要
用3π关联函数在小相对动量区域的幂级数展开,得到了3π关联函数与π源均方根半径的关系.对π源密度的高斯分布,在不考虑和考虑3π事件中的多π关联效应两种情况下,解析地得到了由2π干涉学分析得到的π源空间参数和由3π干涉学分析得到的π源空间参数的理论关系。计算了3π事件中的多π关联引起的2π关联因子的偏离。与小相对动量区域2π干涉学得到的结果和相对论重离子中心碰撞1.8AGeVAr+Pb的实验结果进行了对比。
With the power series expansion of the three-pion correlation function at small relative momentum,the relation between the three-pion correlationand root-mean-square radius of pion source is Obtained analytically.The relations between the space parameters of the pion source from 3πinterferometry and 2πinterferometry are also obtained when multi-pioncorrelation in three-pion events is or is not considered,The distortion of the two-pion coherence factor caused by the multi-pion correlation in three-pion events is calculated.And comparison is made between the results of 2πinterferometry analyses at small relative momentum and the experimental measurements of the central relativistic heavy-ion collision 1.8A GeV Ar+Pb.
作者
陈小凡
Chen Xiaofan(Department of Physics,Harbin Institure of Technology,Harbin 150006)
出处
《高能物理与核物理》
CSCD
北大核心
1998年第10期903-909,共7页
High Energy Physics and Nuclear Physics
关键词
相对论
重离子碰撞
3π干涉学
关联函数
relativistic heavy-ion collision
3πinterferometry
correlation function
