Collinear Limits in QCD from MHV Rules

Abstract

We consider multi-parton collinear limits of QCD amplitudes at tree level. Using the MHV formalism we specify the underlying analytic structure of the resulting multi-collinear splitting functions. We derive general results for these splitting functions that are valid for specific numbers of negative helicity partons and an arbitrary number of positive helicity partons (or vice versa).

arXiv comment27 pages, 5 figures, JHEP3.cls

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• A comparison of efficient methods for the computation of Born gluon amplitudes
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• Double collinear splitting amplitudes at next-to-leading order
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• Polarized triple-collinear splitting functions at NLO for processes with photons
• Soft gluon-quark-antiquark emission in QCD hard scattering
• Revisiting the double-soft asymptotics of one-loop amplitudes in massless QCD
• Collinear functions for QCD resummations
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• Planar radiation zeros in five-parton QCD amplitudes
• Generating MHV super-vertices in light-cone gauge
• Generalized angular-order parton showers in Herwig 7
• Catani's generalization of collinear factorization breaking