Sudakov 重整化中的红外有限耦合:精确的设置
高能物理 - 唯象学
2008-11-26 v3
摘要
我表明,若处理深层散射和 Drell-Yan 过程的短程系数函数的二阶对数导数,Sudakov 重整化可呈现透明形式。唯一确定的 Sudakov 指数出现,而指数中未包含的常数项可被推测为给出无质量夸克电磁形式因子的二阶对数导数。设置了实现无处处修正方法的精确框架,得到的结果与红外 renormalon 的预期一致,但不依赖于单粒子( dress )强子交换近似。指出在低 N_f 情况下,Sudakov 有效耦合可能存在一种 Banks-Zaks 类型的时间固定点。论证 SudaKov 耦合的固定点存在意味着其普适性。
引用
@article{arxiv.hep-ph/0609309,
title = {Infrared finite coupling in Sudakov resummation: the precise set-up},
author = {Georges Grunberg},
journal= {arXiv preprint arXiv:hep-ph/0609309},
year = {2008}
}
备注
5 pages, improved version of hep-ph/0606033, new result on universality of power corrections; version 2: added material, comments and references (to appear in Physical Review D (Rapid Communication)); version 3: a few misprints corrected, one reference added (journal version)