Soft-collinear factorization in effective field theory

被引：1135
|
作者：
Bauer, CW [1 ]
Pirjol, D [1 ]
Stewart, FW [1 ]
机构：
[1] Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA
来源：
PHYSICAL REVIEW D | 2002年 / 65卷 / 05期
关键词：
D O I：
10.1103/PhysRevD.65.054022
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The factorization of soft and ultrasoft gluons from collinear particles is shown at the level of operators in an effective field theory. Exclusive hadronic factorization and inclusive partonic factorization follow as special cases. The leading-order Lagrangian is derived using power counting and gauge invariance in the effective theory. Several species of gluons are required, and softer gluons appear as background fields to gluons with harder momenta. Two examples are given: the factorization of soft gluons in B --> Dpi and the soft-collinear convolution for the B --> X(x)gamma spectrum.
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页数：17
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