External leg corrections in the unitarity method

被引：8

作者：

Britto, Ruth ^{[1
]}

Mirabella, Edoardo ^{[1
]}

机构：

[1] CEA Saclay, Inst Phys Theor, F-91191 Gif Sur Yvette, France

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2012年 / 01期

基金：

美国国家科学基金会; 欧洲研究理事会;

关键词：

NLO Computations; QCD; ONE-LOOP AMPLITUDES; HEAVY-QUARK PRODUCTION; HADRONIC DECAY WIDTH; ALGEBRAIC REDUCTION; FEYNMAN DIAGRAMS; QCD CORRECTIONS; MULTIPLE BREMSSTRAHLUNG; SCATTERING-AMPLITUDES; GENERALIZED UNITARITY; RADIATIVE-CORRECTIONS;

D O I：

10.1007/JHEP01(2012)045

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：

Unitarity cuts diverge in the channel of a single massive external fermion. We propose an off-shell continuation of the momentum that allows a finite evaluation of the unitarity cuts. If the cut is taken with complete amplitudes on each side, our continuation and expansion around the on-shell configuration produces the finite contribution to the bubble coefficient. Finite parts in the expansion of the external leg counterterms must be included explicitly as well.

引用

页数：28

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