双喷注事件中单个喷注内部动力学起伏的蒙特卡洛研究  

Monte Carlo Study for the Dynamical Fluctuations Inside a Single Jet in 2-Jet Events

作　　者：张昆实[1] 尹建武[2] 陈刚[3] 刘超 刘连寿[1] 

机构地区：[1]荆州师范学院物理系,湖北434104 [2]黄冈师范学院物理系,湖北438000 [3]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》2002年第2期158-163,共6页High Energy Physics and Nuclear Physics

基　　金：湖北省教育厅重点项目和国家自然科学基金 ( 1 9975 0 1 8)~~

摘　　要：用蒙特卡洛方法研究了 91 2GeVe+e- 碰撞产生的双喷注事件中单个喷注内部的动力学起伏 .结果表明 ,喷注内部的动力学起伏的各向异性随着截断参数ycut的变化而明显地改变 .存在一个转变点 ,在该点处动力学起伏在纵 横平面是各向异性的 ,而在横平面是各向同性的 .由此得到了产生喷注的一个标度 .The dynamical fluctuations inside a single jet in the 2 jet events produced in e +e - collisions at 91.2GeV have been studied using Monte Carlo method. The results show that,the anisotropy of dynamical fluctuations inside a single jet changes remarkably with the variation of the cut parameter y cut . A transition point ( γ p t =γ φ≠γ y ) exists, where the dynamical fluctuations are anisotropic in the longitudinal transverse plan and isotropic in the transverse planes. It indicates that the y cut corresponding to the transition point is a physically reasonable cutting parameter for selecting jets and, meanwhile,the relative transverse momentum k t at the transition point is the scale for the determination of physical jets. This conclusion is in good agreement with the experimental fact that the third jet (gluon jet) was historically first discovered in the energy region 17\_30GeV in e +e - collisions.

关 键 词：喷注 动力学起伏 高能碰撞 蒙特卡洛 

分 类 号：O572.2[理学—粒子物理与原子核物理]