Quark–gluon antenna functions from neutralino decay

By Aude Gehrmann-De Ridder, Thomas Gehrmann, E. Glover. 2005

157 citations recorded by the source corpus.

Abstract The 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 Letter, 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.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/402cf858576dcabf1e670cd640901fab323e331f

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In Nuclear and High Energy Physics

Citations in the corpus

Infrared structure at NNLO using antenna subtraction (2013, methodology): “The antenna subtraction formalism that is the focus of this paper has been fully developed for all types of scattering processes at NLO [9, 41–43] and further developed at NNLO [9,44–47].”
Event shapes and jet rates in electron-positron annihilation at NNLO (2009, background): “It should be mentioned that the results of this paper rely heavily on research carried out in the past years: Integration techniques for two-loop amplitudes [13–16], the calculation of the relevant tree-, one- and two-loop-amplitudes [17–29], routines for the numerical evaluation of polylogarithms [”
A subtraction scheme for computing QCD jet cross sections at NNLO: regularization of doubly-real emissions (2006, methodology): “xtension of the subtraction method of computing QCD corrections at the next-to-leading order (NLO) accuracy to the computation of the radiative corrections at the next-to-next-to-leading order (NNLO) [1, 2, 3, 4, 5, 6, 7, 8, 9]. In particular, in Ref.[10], a subtraction scheme was deﬁned for computi”