中文

QCD中阈值修正的幂次精度重求和:以Drell-Yan截面为例

高能物理 - 唯象学 2015-06-25 v1

摘要

在微扰论中,对大的红外对数的重求和在某些情况下会增强对小动量胶子的敏感性,并引入虚假的非微扰贡献。特别是,不同的重求和程序——在微扰论中等价——可能相差 1/Q1/Q 幂次修正。问题在于,能否构造出与有限阶费曼图的红外行为明确一致的重求和程序。我们解释了如何在Drell-Yan(轻子对)产生中处理和解决这个问题,并简要讨论了更复杂的情况,如顶夸克产生和 e+ee^+e^- 湮灭中的事件形状变量。

引用

@article{arxiv.hep-ph/9605375,
  title  = {Resummation of threshold corrections in QCD to power accuracy: the Drell-Yan cross section as a case study},
  author = {M. Beneke and V. M. Braun},
  journal= {arXiv preprint arXiv:hep-ph/9605375},
  year   = {2015}
}

备注

12 pages, LATEX, requires sprocl.sty (included); To appear in the Proceedings of Second Workshop on Continuous Advances in QCD (Minneapolis, U.S.A., March 1996) and 1996 Zeuthen Workshop on Elementary Particle Theory: QED and QCD in Higher Orders (Rheinsberg, Germany, April 1996)