Choice of heavy baryon currents in QCD sum rules

被引:23
|
作者
Wang, DW [1 ]
Huang, MQ
机构
[1] Natl Univ Def Technol, Dept Appl Phys, Hunan 410073, Peoples R China
[2] CCAST, World Lab, Beijing 100080, Peoples R China
来源
PHYSICAL REVIEW D | 2003年 / 67卷 / 07期
关键词
D O I
10.1103/PhysRevD.67.074025
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
In this paper we investigate the effects due to the mixing of two interpolating currents for ground-state baryons within the framework of heavy quark effective theory using the QCD sum rule approach. Both two-point and three-point sum rules, and thus the mass, coupling constant, and Isgur-Wise function sum rules are considered. It is interesting to contrast those results with each other. Based on the Isgur-Wise functions obtained in this paper, we also analyze the effects of current mixing to Lambda type and and Sigma type semileptonic decays Lambda(b)-->Lambda(c)l (nu) over bar, Sigma(b)-->Sigma(c)l (nu) over bar, and Sigma(b)-->Sigma(c)(*)l (nu) over bar. Decay widths corresponding to various mixing parameters are obtained and can be compared to the experimental data.
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页数:9
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