正负电子湮灭中正反夸克喷注内部动力学起伏的研究  

On the Dynamical Fluctuations Inside Quark and Antiquark Jets Produced in e^+e^- Annihilation

作　　者：张昆实[1] 陈刚[1] 

机构地区：[1]荆州师范学院物理系,湖北荆州434020

出　　处：《科技通报》2004年第1期33-36,共4页Bulletin of Science and Technology

基　　金：湖北省教育厅重点资助项目(2003A002)

摘　　要：用蒙特卡洛方法研究了夸克喷注和反夸克喷注内部的动力学起伏.夸克和反夸克喷注从91.2GeV正负电子湮灭的2-喷注事件中在部分子层次上被区分出来.结果显示,在这两种喷注中都存在着一个转变点.在转变点处,动力学起伏在纵-横平面内是各向异性的,而在横平面内是各向同性的.由此得到了实验中可观察喷注的物理标度.Quark and antiquark jets are identified from the 2-jet events in e^+e^- annihilations at 91.2 GeV by checking them at parton level. The dynamical fluctuations inside the quark and antiquark jets, being similar to each other, are studied using the Monte Carlo method. The results show that a transition point exists inside both of these two kinds of jets, where the dynamical fluctuations is anisotropic in the longitudinal-transverse planes and isotropic in the transverse plane and thereby a scale for determining the visible jet in experiments is obtained.

关 键 词：高能物理学 粒子物理 软硬过程 夸克喷注 反夸克喷注 动力学起伏 正负电子湮灭 蒙特卡洛方法 

分 类 号：O572.33[理学—粒子物理与原子核物理]