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D~+→■~0l~+ν_l衰变过程分支比的计算
Calculation of the Branching Ratio for D~+→■~0l~+ν_l Decay
【摘要】 通过QCD求和规则研究D+→K-0l+lν衰变过程,计算D→K跃迁形状因子,通过构造新的关联函数,消除了twist-3波函数的不确定性对计算结果的影响,使计算结果更精确.计算得到的分支比与实验数据一致.
【Abstract】 The D~+→~■0l~+ν_l decay was researched by means of QCD sum rules.Firstly,the form factor of D→K was calculated by chosing a new correlative function to eliminate the effect caused by the uncertainty of twist-3 function,so the calculation result of the form factor is more precisely,and the branch ratio is consistent with the experimental data.
【关键词】 QCD求和规则;
D介子半轻衰变;
分支比;
形状因子;
【Key words】 QCD sum rule; D semileptonic decay; branching ratio; form factor;
【Key words】 QCD sum rule; D semileptonic decay; branching ratio; form factor;
【基金】 安徽省教育厅自然科学基金(批准号:2004KJ323)
- 【文献出处】 吉林大学学报(理学版) ,Journal of Jilin University(Science Edition) , 编辑部邮箱 ,2006年05期
- 【分类号】O571.3
- 【下载频次】33