High-energy QCD amplitudes at two loops and beyond

Vittorio Del Duca*, Giulio Falcioni, Lorenzo Magnea, Leonardo Vernazza

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

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. (C) 2014 The Authors. Published by Elsevier B.V.

Original languageEnglish
Pages (from-to)233-240
Number of pages8
JournalPhysics Letters B
Volume732
DOIs
Publication statusPublished - 1 May 2014

Keywords

  • YANG-MILLS THEORY
  • SCATTERING-AMPLITUDES
  • GAUGE THEORIES
  • LEADING ORDER
  • WILSON LOOPS
  • FORM-FACTOR
  • REGGEIZATION
  • RENORMALIZATION
  • SINGULARITY
  • RESUMMATION

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