Quark-Gluon Antenna Functions from Neutralino Decay

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dc.creatorRidder, A. Gehrmann--De
dc.creatorGehrmann, T.
dc.creatorGlover, E. W. N.
dc.date2005-01-31
dc.date2005-02-18
dc.date.accessioned2026-07-07T10:29:24Z
dc.date.available2026-07-07T10:29:24Z
dc.descriptionThe computation of exclusive QCD jet observables at higher orders requires a method for the subtraction of infrared singular configurations arising from multiple radiation of real partons. One commonly used method at next-to-leading order (NLO) is based on the antenna factorization of colour-ordered matrix elements, and uses antenna functions to subtract the real radiation singularities. Up to now, NLO antenna functions could be derived in a systematic manner only for hard quark-antiquark pairs, while the gluon-gluon and quark-gluon antenna functions were constructed from their limiting behaviour. In this paper, we show that antenna functions for hard quark-gluon pairs can be systematically derived from an effective Lagrangian describing heavy neutralino decay. The infrared structure of the colour-ordered neutralino decay matrix elements at NLO and NNLO is shown to agree with the structure observed for parton radiation off a quark-gluon antenna.
dc.description13 pages, 3 figures, minor typos corrected, references added
dc.identifierhttps://arxiv.org/abs/hep-ph/0501291
dc.identifierhttp://arxiv.org/abs/hep-ph/0501291
dc.identifierPhys.Lett.B612:36-48,2005
dc.identifierdoi:10.1016/j.physletb.2005.02.039
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/177788
dc.subjectHigh Energy Physics - Phenomenology
dc.titleQuark-Gluon Antenna Functions from Neutralino Decay
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