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Title
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Soft gluons and gauge-invariant subtractions in NLO parton-shower Monte Carlo event generators
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Author
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Abstract
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| 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. |
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Language
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English
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Source (journal)
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Journal of high energy physics. - Bristol
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Publication
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Bristol
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2001
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ISSN
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1126-6708
1029-8479
[online]
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Volume/pages
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3
(2001)
, 11 p.
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Article Reference
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016
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ISI
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000168484700016
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Medium
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E-only publicatie
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