夸克喷注与胶子喷注角分布特性的研究

用蒙特卡洛模拟Jetset 7.4产生质心能量为91.2GeV的正负电子对撞事件. 在引入喷注的圆锥角后, 对不同味的夸克喷注和由不同味夸克发射的胶子产生的喷注的角分布特性进行了仔细研究. 结果发现, 在相同的能量下, 胶子喷注的角分布范围比夸克喷注的角分布范围要明显宽一些. 在带电粒子数、横动量相同的条件下, 胶子喷注的平均圆锥角比夸克喷注的平均圆锥角大很多. 喷注的平均圆锥角随带电多重数以及喷注的横动量的分布都呈线性正关联. 由不同味的夸克发射的胶子产生的喷注的圆锥角分布特性相同；而不同味的夸克喷注的圆锥角分布存在明显的差异.

Study on the Characters of Angular Distribution of Quark Jets and Gluon Jets

The 3-jet events are produced by Monte Carlo simulation Jetset7.4 in e~ e~-collisions at s~(1/2)=91.2GeV. After introducing the cone angle of jets,we carefully studied the characters of the angular distributions of quark jets and gluon jets with different flavors.It turns out that the ranges of angular distributions of gluon jets are obviously wider than that of quark jets at the same energies.The average cone angles of gluon jets are much larger than that of quark jets for the same charged particle multiplicity or the same transverse momentum.There are linear relations in the distributions of the average cone angles of jets as functions of the charged multiplicity and the transverse momentum. The angular distribution properties of gluon jets produced by quarks with different flavors are the same,while there are obvious differences among the distributions of cone angles for quark jets of different flavors.