Cargando…

NLO QCD+EW predictions for $tHj$ and $tZj$ production at the LHC

In this work we calculate the cross sections for the hadroproduction of a single top quark or antiquark in association with a Higgs (tHj) or Z boson (tZj) at NLO QCD+EW accuracy. In the case of tZj production we consider both the case of the Z boson undecayed and the complete final state tℓ$^{+}$ℓ$^...

Descripción completa

Detalles Bibliográficos
Autores principales: Pagani, Davide, Tsinikos, Ioannis, Vryonidou, Eleni
Lenguaje:eng
Publicado: 2020
Materias:
Acceso en línea:https://dx.doi.org/10.1007/JHEP08(2020)082
http://cds.cern.ch/record/2722578
_version_ 1780965906108645376
author Pagani, Davide
Tsinikos, Ioannis
Vryonidou, Eleni
author_facet Pagani, Davide
Tsinikos, Ioannis
Vryonidou, Eleni
author_sort Pagani, Davide
collection CERN
description In this work we calculate the cross sections for the hadroproduction of a single top quark or antiquark in association with a Higgs (tHj) or Z boson (tZj) at NLO QCD+EW accuracy. In the case of tZj production we consider both the case of the Z boson undecayed and the complete final state tℓ$^{+}$ℓ$^{−}$j, including off-shell and non-resonant effects. We perform our calculation in the five-flavour-scheme (5FS), without selecting any specific production channel (s-, t- or tW associated). Moreover, we provide a more realistic estimate of the theory uncertainty by carefully including the differences between the four-flavour-scheme (4FS) and 5FS predictions. The difficulties underlying this procedure in the presence of EW corrections are discussed in detail. We find that NLO EW corrections are in general within the NLO QCD theory uncertainties only if the flavour scheme uncertainty (4FS vs. 5FS) is taken into account. For the case of tℓ$^{+}$ℓ$^{−}$j production we also investigate differences between NLO QCD+EW predictions and NLO QCD predictions matched with a parton shower simulation including multiple photon emissions.
id cern-2722578
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2020
record_format invenio
spelling cern-27225782022-07-28T07:21:21Zdoi:10.1007/JHEP08(2020)082http://cds.cern.ch/record/2722578engPagani, DavideTsinikos, IoannisVryonidou, EleniNLO QCD+EW predictions for $tHj$ and $tZj$ production at the LHChep-exParticle Physics - Experimenthep-phParticle Physics - PhenomenologyIn this work we calculate the cross sections for the hadroproduction of a single top quark or antiquark in association with a Higgs (tHj) or Z boson (tZj) at NLO QCD+EW accuracy. In the case of tZj production we consider both the case of the Z boson undecayed and the complete final state tℓ$^{+}$ℓ$^{−}$j, including off-shell and non-resonant effects. We perform our calculation in the five-flavour-scheme (5FS), without selecting any specific production channel (s-, t- or tW associated). Moreover, we provide a more realistic estimate of the theory uncertainty by carefully including the differences between the four-flavour-scheme (4FS) and 5FS predictions. The difficulties underlying this procedure in the presence of EW corrections are discussed in detail. We find that NLO EW corrections are in general within the NLO QCD theory uncertainties only if the flavour scheme uncertainty (4FS vs. 5FS) is taken into account. For the case of tℓ$^{+}$ℓ$^{−}$j production we also investigate differences between NLO QCD+EW predictions and NLO QCD predictions matched with a parton shower simulation including multiple photon emissions.In this work we calculate the cross sections for the hadroproduction of a single top quark or antiquark in association with a Higgs ($tHj$) or $Z$ boson ($tZj$) at NLO QCD+EW accuracy. In the case of $tZj$ production we consider both the case of the $Z$ boson undecayed and the complete final state $t \ell^+ \ell^- j$, including off-shell and non-resonant effects. We perform our calculation in the five-flavour-scheme (5FS), without selecting any specific production channel ($s$-, $t$- or $tW$ associated). Moreover, we provide a more realistic estimate of the theory uncertainty by carefully including the differences between the four-flavour-scheme (4FS) and 5FS predictions. The difficulties underlying this procedure in the presence of EW corrections are discussed in detail. We find that NLO EW corrections are in general within the NLO QCD theory uncertainties only if the flavour scheme uncertainty (4FS vs.~5FS) is taken into account. For the case of $t \ell^+ \ell^- j$ production we also investigate differences between NLO QCD+EW predictions and NLO QCD predictions matched with a parton shower simulation including multiple photon emissions.arXiv:2006.10086DESY-20-101LU-TP 20-33CERN-TH-2020-090oai:cds.cern.ch:27225782020-06-17
spellingShingle hep-ex
Particle Physics - Experiment
hep-ph
Particle Physics - Phenomenology
Pagani, Davide
Tsinikos, Ioannis
Vryonidou, Eleni
NLO QCD+EW predictions for $tHj$ and $tZj$ production at the LHC
title NLO QCD+EW predictions for $tHj$ and $tZj$ production at the LHC
title_full NLO QCD+EW predictions for $tHj$ and $tZj$ production at the LHC
title_fullStr NLO QCD+EW predictions for $tHj$ and $tZj$ production at the LHC
title_full_unstemmed NLO QCD+EW predictions for $tHj$ and $tZj$ production at the LHC
title_short NLO QCD+EW predictions for $tHj$ and $tZj$ production at the LHC
title_sort nlo qcd+ew predictions for $thj$ and $tzj$ production at the lhc
topic hep-ex
Particle Physics - Experiment
hep-ph
Particle Physics - Phenomenology
url https://dx.doi.org/10.1007/JHEP08(2020)082
http://cds.cern.ch/record/2722578
work_keys_str_mv AT paganidavide nloqcdewpredictionsforthjandtzjproductionatthelhc
AT tsinikosioannis nloqcdewpredictionsforthjandtzjproductionatthelhc
AT vryonidoueleni nloqcdewpredictionsforthjandtzjproductionatthelhc