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arXiv · 1706.04018

Universality of next-to-leading power threshold effects for colourless final states in hadronic collisions

V. Del Duca·E. Laenen·L. Magnea·L. Vernazza·C. D. White
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Abstract

We consider the production of an arbitrary number of colour-singlet particles near partonic threshold, and show that next-to-leading order cross sections for this class of processes have a simple universal form at next-to-leading power (NLP) in the energy of the emitted gluon radiation. Our analysis relies on a recently derived factorisation formula for NLP threshold effects at amplitude level, and therefore applies both if the leading-order process is tree-level and if it is loop-induced. It holds for differential distributions as well. The results can furthermore be seen as applications of recently derived next-to-soft theorems for gauge theory amplitudes. We use our universal expression to re-derive known results for the production of up to three Higgs bosons at NLO in the large top mass limit, and for the hadro-production of a pair of electroweak gauge bosons. Finally, we present new analytic results for Higgs boson pair production at NLO and NLP, with exact top-mass dependence.

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V. Del Duca, E. Laenen, L. Magnea, L. Vernazza, C. D. White. 2017-06-13. Universality of next-to-leading power threshold effects for colourless final states in hadronic collisions. https://doi.org/10.1007/jhep11(2017)057

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