Soft gluons and gauge-invariant subtractions in NLO parton-shower Monte Carlo event generators

John C. Collins, Francesco Hautmann

Research output: Contribution to journalArticlepeer-review

36 Scopus citations

Abstract

We address the problem of decomposing graphs in perturbative QCD into terms associated with particular regions. Motivated by asking how to incorporate next-to-leading order (NLO) QCD corrections in parton-shower algorithms, we require that: (a) The integrand for the hard part is to be integrable even if the corrections are applied to a process that is not infrared and collinear safe, (b) The splitting between the terms should be defined gauge-invariantly. (c) The dependence on cut-offs should obey homogeneous evolution equations. In the context of one-gluon-emission graphs for deep inelastic scattering, we explain a subtractive technique that is based on gauge-invariant Wilson-line operators. Appropriate organization of subtractions involving the soft region allows a connection to previous work where evolution equations with respect to the directions of the Wilson lines have been derived.

Original languageEnglish (US)
Pages (from-to)XXVI-10
JournalJournal of High Energy Physics
Volume5
Issue number3
DOIs
StatePublished - 2001

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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