D+→K0l+νl衰变过程分支比的计算

D⁺→K⁰l⁺ν_l衰变过程分支比的计算

王光怀¹, 刘晓静¹, 公丕锋², 赵书华¹, 郭义庆³ 

1. 吉林师范大学物理学院, 吉林省四平 136000; 2. 安徽淮北煤炭师范学院物理系, 安徽省淮北 235000; 3. 中国科学院高能物理研究所, 北京 100039

收稿日期:2005-11-07 修回日期:1900-01-01 出版日期:2006-09-26 发布日期:2006-09-26
通讯作者: 王光怀

Calculation of the Branching Ratio for D⁺→K⁰l⁺ν_l Decay

WANG Guang huai¹, LIU Xiao jing¹, GONG Pi feng², ZHAO Shu hua¹, GUO Yi qing³

1. College of Physics, Jilin Normal University, Siping 136000, Jilin Province, China; 2. Department of Physics, Huaibei Coal Industry Teacher’s College, Huaibei 235000, Anhui Province, China; 3. Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039, China

Received:2005-11-07 Revised:1900-01-01 Online:2006-09-26 Published:2006-09-26
Contact: WANG Guang huai

摘要/Abstract

摘要： 通过QCD求和规则研究D⁺→K⁰l⁺ν_l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.

关键词: QCD求和规则, D介子半轻衰变, 分支比, 形状因子

Abstract: The D⁺→K⁰l⁺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.

Key words: QCD sum rule, D semileptonic decay, branching ratio, form factor 

中图分类号:

O572.33

王光怀, 刘晓静, 公丕锋, 赵书华, 郭义庆 . D⁺→K⁰l⁺ν_l衰变过程分支比的计算[J]. J4, 2006, 44(05): 779-783.

WANG Guang huai, LIU Xiao jing, GONG Pi feng, ZHAO Shu hua, GUO Yi qing. Calculation of the Branching Ratio for D⁺→K⁰l⁺ν_l Decay[J]. J4, 2006, 44(05): 779-783.

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D⁺→K⁰l⁺ν_l衰变过程分支比的计算

Calculation of the Branching Ratio for D⁺→K⁰l⁺ν_l Decay

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