2-LOOP CORRECTIONS TO THE ISGUR-WISE FUNCTION IN QCD SUM-RULES

被引：42
作者：
NEUBERT, M
机构：
[1] Stanford Linear Accelerator Center, Stanford University, Stanford
来源：
PHYSICAL REVIEW D | 1993年 / 47卷 / 09期
关键词：
D O I：
10.1103/PhysRevD.47.4063
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We complete the QCD sum rule analysis of the Isgur-Wise form factor xi(v . v') at next-to-leading order in renormalization-group improved perturbation theory. To this end, the exact result for the two-loop corrections to the perturbative contribution is derived using the heavy quark effective theory. Several techniques for the evaluation of two-loop integrals involving two different types of heavy quark propagators are discussed in detail, among them the methods of integration by parts and differential equations. The order-alpha(s) corrections to the Isgur-Wise function turn out to be small and well under control. At large recoil, they tend to decrease the form factor by 5-10%.
引用
收藏
页码：4063 / 4076
页数：14
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