摘要
传统高能e+ e-→hadrons事例产生器普遍采用大Nc 近似 ,使色单态链产生几率达到 10 0 %而色分离态几率为 0 .本文在Nc=3的真实情况下 ,研究了干涉项中颜色部分和动量部分的来源及性质后发现 ,对e+ e-→qq +ng部分子末态中胶子数 2 ,3,干涉项使色单态链产生几率进一步下降到 6 7% ,5 8% ,而n =2时的色分离态几率则增大至不考虑干涉项的 2倍 .由上推断当胶子数n更大时色单态链几率将远小于 1。
Large N c approximation is adopted in popular e +e - event generators where the production probability of singlet chain states is 100% and that of color separate states is 0. In the real world N c=3, we investigate the origin and character of color and kinematics aspects in interference terms. We find that the production probability of color singlet chain states decreases from 83%, 77% to 67%, 58% for q q +2g and q q +3g system respectively after considering the interference terms. Especially, the production probability of color separate states increases to twice of that without interference terms for q q +2g. Hence when n is larger, we can expect that the production probability of singlet chain states will be far less than 1 and that of color separate states will significantly increase when n is larger.
出处
《高能物理与核物理》
CSCD
北大核心
2003年第4期282-287,共6页
High Energy Physics and Nuclear Physics
基金
国家自然科学基金 ( 10 0 75 0 3 110 2 0 5 0 0 9)资助~~
