A factorization approach to next-to-leading-power threshold logarithms

D. Bonocore, E. Laenen, L. Magnea, S. Melville, L. Vernazza, C. D. White

Research output: Contribution to journalArticlepeer-review

Abstract

Threshold logarithms become dominant in partonic cross sections when the selected final state forces gluon radiation to be soft or collinear. Such radiation factorizes at the level of scattering amplitudes, and this leads to the resummation of threshold logarithms which appear at leading power in the threshold variable. In this paper, we consider the extension of this factorization to include effects suppressed by a single power of the threshold variable. Building upon the Low-Burnett-Kroll-Del Duca (LBKD) theorem, we propose a decomposition of radiative amplitudes into universal building blocks, which contain all effects ultimately responsible for next-to-leading-power (NLP) threshold logarithms in hadronic cross sections for electroweak annihilation processes. In particular, we provide a NLO evaluation of the radiative jet function, responsible for the interference of next-to-soft and collinear effects in these cross sections. As a test, using our expression for the amplitude, we reproduce all abelian-like NLP threshold logarithms in the NNLO Drell-Yan cross section, including the interplay of real and virtual emissions. Our results are a significant step towards developing a generally applicable resummation formalism for NLP threshold effects, and illustrate the breakdown of next-to-soft theorems for gauge theory amplitudes at loop level.

Original languageEnglish
Article number008
Number of pages34
JournalJournal of High Energy Physics
Issue number6
Early online date3 Jun 2015
DOIs
Publication statusPublished - Jun 2015

Keywords

  • QCD Phenomenology
  • YAN CROSS-SECTION
  • DRELL-YAN
  • LARGE-X
  • SOFT CORRECTIONS
  • HIGGS-BOSON
  • K-FACTOR
  • RESUMMATION
  • RENORMALIZATION
  • BREMSSTRAHLUNG
  • QUARK

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