Cuts for two-body decays at colliders

Abstract Fixed-order perturbative calculations of fiducial cross sections for two-body decay processes at colliders show disturbing sensitivity to unphysically low momentum scales and, in the case of H → γγ in gluon fusion, poor convergence. Such problems have their origins in an interplay between t...

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Autores principales:	Gavin P. Salam, Emma Slade
Formato:	article
Lenguaje:	EN
Publicado:	SpringerOpen 2021
Materias:	NLO Computations QCD Phenomenology Nuclear and particle physics. Atomic energy. Radioactivity QC770-798
Acceso en línea:	https://doaj.org/article/a27956ea1ce34278806b845fe42c39e3
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id	oai:doaj.org-article:a27956ea1ce34278806b845fe42c39e3
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spelling	oai:doaj.org-article:a27956ea1ce34278806b845fe42c39e32021-12-05T12:25:05ZCuts for two-body decays at colliders10.1007/JHEP11(2021)2201029-8479https://doaj.org/article/a27956ea1ce34278806b845fe42c39e32021-11-01T00:00:00Zhttps://doi.org/10.1007/JHEP11(2021)220https://doaj.org/toc/1029-8479Abstract Fixed-order perturbative calculations of fiducial cross sections for two-body decay processes at colliders show disturbing sensitivity to unphysically low momentum scales and, in the case of H → γγ in gluon fusion, poor convergence. Such problems have their origins in an interplay between the behaviour of standard experimental cuts at small transverse momenta (p t ) and logarithmic perturbative contributions. We illustrate how this interplay leads to a factorially divergent structure in the perturbative series that sets in already from the first orders. We propose simple modifications of fiducial cuts to eliminate their key incriminating characteristic, a linear dependence of the acceptance on the Higgs or Z-boson p t , replacing it with quadratic dependence. This brings major improvements in the behaviour of the perturbative expansion. More elaborate cuts can achieve an acceptance that is independent of the Higgs p t at low p t , with a variety of consequent advantages.Gavin P. SalamEmma SladeSpringerOpenarticleNLO ComputationsQCD PhenomenologyNuclear and particle physics. Atomic energy. RadioactivityQC770-798ENJournal of High Energy Physics, Vol 2021, Iss 11, Pp 1-61 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	NLO Computations QCD Phenomenology Nuclear and particle physics. Atomic energy. Radioactivity QC770-798
spellingShingle	NLO Computations QCD Phenomenology Nuclear and particle physics. Atomic energy. Radioactivity QC770-798 Gavin P. Salam Emma Slade Cuts for two-body decays at colliders
description	Abstract Fixed-order perturbative calculations of fiducial cross sections for two-body decay processes at colliders show disturbing sensitivity to unphysically low momentum scales and, in the case of H → γγ in gluon fusion, poor convergence. Such problems have their origins in an interplay between the behaviour of standard experimental cuts at small transverse momenta (p t ) and logarithmic perturbative contributions. We illustrate how this interplay leads to a factorially divergent structure in the perturbative series that sets in already from the first orders. We propose simple modifications of fiducial cuts to eliminate their key incriminating characteristic, a linear dependence of the acceptance on the Higgs or Z-boson p t , replacing it with quadratic dependence. This brings major improvements in the behaviour of the perturbative expansion. More elaborate cuts can achieve an acceptance that is independent of the Higgs p t at low p t , with a variety of consequent advantages.
format	article
author	Gavin P. Salam Emma Slade
author_facet	Gavin P. Salam Emma Slade
author_sort	Gavin P. Salam
title	Cuts for two-body decays at colliders
title_short	Cuts for two-body decays at colliders
title_full	Cuts for two-body decays at colliders
title_fullStr	Cuts for two-body decays at colliders
title_full_unstemmed	Cuts for two-body decays at colliders
title_sort	cuts for two-body decays at colliders
publisher	SpringerOpen
publishDate	2021
url	https://doaj.org/article/a27956ea1ce34278806b845fe42c39e3
work_keys_str_mv	AT gavinpsalam cutsfortwobodydecaysatcolliders AT emmaslade cutsfortwobodydecaysatcolliders
_version_	1718371975567507456

Cuts for two-body decays at colliders

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