Full one-loop amplitudes from tree amplitudes

被引：207

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

页数：23

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