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重夸克展开至次领头阶D→Klν衰变的研究 被引量：1

Studies on D→Klν decay via heavy quark expansion to NLO
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摘要 在重夸克有效场论(HQEFT)的框架内,重夸克展开至次领头阶,对半轻衰变D→Klν进行了研究.首先利用光锥求和规则计算了D→K跃迁形状因子.计算表明,重夸克展开次领头阶对D→K跃迁形状因子的贡献非常大,约为领头阶贡献的40%,因而是不能忽略的.在此基础上计算了相应半轻衰变过程的分支比,D0→K-l+ν分支比的结果与实验符合的非常好,D+→K0l+ν的分支比也在误差允许的范围内与实验一致. The semileptonic decay D→Klν is investigated via heavy quark expansion to next leading order（NLO） in the framework of heavy quark effective field theory（HQEFT）.The D→K transition form factors are calculated by using light cone sum rules.It is found that the contributions from NLO are significantly large,around 40% of the leading order and therefore can not be neglected.Then the D→Klν branching ratios are evaluated.The branching ratio for D0→K-l＋ν is consistent with the current experimental data and that for D＋→K0l＋ν is also compatible with experiments within the uncertainties.
作者 左亚兵 何建华 田园园
机构地区 辽宁师范大学物理与电子技术学院
出处 《辽宁师范大学学报（自然科学版）》 CAS 2012年第4期471-477,共7页 Journal of Liaoning Normal University:Natural Science Edition
基金 国家自然科学基金项目(10847142)
关键词 重夸克展开 次领头阶 形状因子 分支比 heavy quark expansion NLO form factors branching ratio
分类号 O572.3 [理学—粒子物理与原子核物理]
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参考文献10

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同被引文献9

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辽宁师范大学学报（自然科学版）
2012年 第4期

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