基于关联度的高阶集合流关联分析方法  

Analysis Method of High-Order Collective-Flow Correlations Based on the Concept of Correlative Degree

作　　者：张伟刚 

机构地区：[1]广西工业学院教务处,柳州545005

出　　处：《高能物理与核物理》2000年第10期962-968,共7页High Energy Physics and Nuclear Physics

基　　金：广西自然科学基金资助!(桂科青 981 1 0 1 6)&&

摘　　要：基于关联度概念 ,建立了可以分别检测高阶集合流的方位角关联、横向动量模关联和横向关联的新方法 .采用新方法分别分析了 1 2AGeVAr +BaI2 碰撞的Bevalac流光室 4π实验事件中末态粒子分布的方位角关联与粒子横向动量模的关联对高阶集合流关联的贡献 .研究表明 :对于这组碰撞实验 ,末态粒子分布的方位角关联相对横向动量模的关联在高阶集合流关联中起主要作用 ;末态粒子横向动量模的关联不但可以使粒子群高阶关联的强度有所增加 ,而且还为在更为狭窄的区间上确定集合流集体性的范围提供了重要信息 .Based on the concept of correlative degree, a new method of high order collective flow measurement is constructed in this paper, with which azimuthal correlations, correlations of final state transverse momentum magnitude and transverse correlations can be inspected respectively. Using the new method the contributions of the azimuthal correlations of particles distribution and the correlations of transverse momentum magnitude of final state particles to high order collective flow correlations are analyzed respectively with 4π experimental events for 1.2A GeV Ar+BaI 2 collisions at the Bevalac stream chamber. Comparing with the correlations of transverse momentum magnitude, the azimuthal correlations of final state particles distribution dominate high order collective flow correlations in this experimental samples. The contributions of correlations of transverse momentum magnitude of final state particles not only enhance the strength of the high order correlations of particle group, but also provide important information for the measurement of the collectivity of collective flow within the more constraint district.

关 键 词：关联度 高阶集合流关联 相对论重离子碰撞 

分 类 号：O571[理学—粒子物理与原子核物理]