Full one-loop amplitudes from tree amplitudes

被引：206
|
作者：
Giele, Walter T. [1 ]
Kunszt, Zoltan [2 ]
Melnikov, Kirill [3 ]
机构：
[1] Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA
[2] ETH, Inst Theoret Phys, CH-8093 Zurich, Switzerland
[3] Univ Hawaii, Dept Phys & Astron, Honolulu, HI 96822 USA
来源：
JOURNAL OF HIGH ENERGY PHYSICS | 2008年 / 04期
关键词：
NLO computations; QCD;
D O I：
10.1088/1126-6708/2008/04/049
中图分类号：
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号：
摘要：
We establish an efficient polynomial-complexity algorithm for one-loop calculations, based on generalized D-dimensional unitarity. It allows automated computations of both cut-constructible and rational parts of one-loop scattering amplitudes from on-shell tree amplitudes. We illustrate the method by (re)-computing all four-, five- and six-gluon scattering amplitudes in QCD at one-loop.
引用
收藏
页数：23
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