High-energy QCD amplitudes at two loops and beyond

High-energy QCD amplitudes at two loops and beyond
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两个环路及以上的高能 QCD 振幅

DOI:
10.1016/j.physletb.2014.03.033
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发表时间:
2013
期刊:
影响因子:
4.4
通讯作者:
L. Vernazza
L. Vernazza
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
V. Duca;G. Falcioni;L. Magnea;L. Vernazza

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我们对多部分子振幅的红外奇点的理解的最新进展表明,高能量规理论振幅的最简单形式的Regge分解从倒数第二到倒数第一的对数精度开始失败。我们提供了一个框架来组织以t/s为单位的主导功率的部分振幅的计算,根据因子分解和非因子分解贡献。这允许我们给出QCD中双环和三环夸克和胶子振幅的主要注册破环项的显式表达式。特别是,仅使用红外信息,我们在两个环路上恢复了已知的非因式、非对数双极贡献,并在三个环路上计算了主要的非因式单对数贡献。
Recent progress in our understanding of infrared singularities of multi-parton amplitudes has shown that the simplest form of Regge factorization for high-energy gauge-theory amplitudes fails starting at next-to-next-to-leading logarithmic accuracy. We provide a framework to organize the calculation of parton amplitudes at leading power in t/s, in terms of factorizing and non-factorizing contributions. This allows us to give explicit expressions for the leading reggeization-breaking terms in two-loop and three-loop quark and gluon amplitudes in QCD. In particular, using only infrared information, we recover a known non-factorizing, non-logarithmic double-pole contribution at two-loops, and we compute the leading non-factorizing single-logarithmic contributions at three loops.
红外方法进行调整
DOI: 10.1103/physrevd.85.071104
发表时间: 2012
期刊: Physical Review D
影响因子: 5
作者:
Del Duca V
通讯作者: Del Duca V
DOI: 10.1007/jhep12(2011)021
发表时间: 2011
影响因子: 5.4
作者:
Del Duca V
通讯作者: Del Duca V
DOI: 10.1007/jhep09(2012)138
发表时间: 2012-08
影响因子: 5.4
作者:
Valentin Ahrens;M. Neubert;L. Vernazza
通讯作者: Valentin Ahrens;M. Neubert;L. Vernazza