色重组负关联效应的起源(英文)  

On the Origin of the Negative Correlation Effect of Colour Reconnection

作　　者：喻梅凌[1] 刘连寿[1] 

机构地区：[1]华中师范大学粒子物理研究所,武汉430079

出　　处：《高能物理与核物理》2000年第3期275-278,共4页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金!19575021

摘　　要：最近提出Ｗ~＋Ｗ~－强子衰变过程中的负关联效应可能是色重组的信号。采用随机级联 ａ模型研究这一效应。在模型中假设色重组导致 Ｗ~ ＋ Ｗ~－衰变形成的两个未态系统之间的粒子发生交换。根据这一物理图象可以再现Ｐｙｔｈｉａ事件产生器所得到的负关联。The negative correlation in W^+ W^- hadronic decay, which has recently been proposed as a possible signal for the colour reconnection in these proceses, is studied in some detail by using the random cascadingα-model. The effect of colour reconnection is modeled by the particle exchange be- tween two final state systems forming from two W's. The negative correlation given by Pythia event generator is recovered in this way, providing a physical picture for this effect.

关 键 词：色重组 阶乘关联矩 负关联 强子 

分 类 号：O571[理学—粒子物理与原子核物理]