用能量排序法辨别胶子和夸克喷注的研究

摘要

改进了用于从正负电子碰撞的三喷注事件中辨别胶子喷注和夸克喷注的能量方法, 使挑选喷注的纯度提高到71%.计算了用改进后的能量方法挑选出的胶子喷注和夸克喷注的平均多重数的比值R=〈N〉g/〈N〉q 结果为1.30＜R＜1.50.这些结果与QCD的预言以及NRS,OPAL和DELPHI实验组获得的正负电子碰撞的实验数据符合.%The energy ordering method for identification of gluon and quark jets from 3-jet events in e+e- collisions has been improved with a selecting purity of 71%. The ratio of the mean multiplicity between gluon and quark jets,R=〈N〉g/〈N〉q,selected using the improved method is calculated.It is turned out that 1.30＜R＜1.50 .These results agree with the e+e- experimental data obtained by NRS,OPAL and DELPHI collaborations as well as the expectations of QCD.