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

Pagani, Davide ; Tsinikos, Ioannis LU and Vryonidou, Eleni (2020) In Journal of High Energy Physics 2020(8).
Abstract

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... (More)

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.

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author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
NLO Computations, QCD Phenomenology
in
Journal of High Energy Physics
volume
2020
issue
8
article number
82
publisher
Springer
external identifiers
  • scopus:85089726086
ISSN
1126-6708
DOI
10.1007/JHEP08(2020)082
language
English
LU publication?
yes
id
22ce23bb-3b73-4ce8-b05d-f911edea2109
date added to LUP
2020-09-08 13:44:26
date last changed
2024-03-20 15:26:01
@article{22ce23bb-3b73-4ce8-b05d-f911edea2109,
  abstract     = {{<p>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<sup>+</sup>ℓ<sup>−</sup>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<sup>+</sup>ℓ<sup>−</sup>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.</p>}},
  author       = {{Pagani, Davide and Tsinikos, Ioannis and Vryonidou, Eleni}},
  issn         = {{1126-6708}},
  keywords     = {{NLO Computations; QCD Phenomenology}},
  language     = {{eng}},
  number       = {{8}},
  publisher    = {{Springer}},
  series       = {{Journal of High Energy Physics}},
  title        = {{NLO QCD+EW predictions for tHj and tZj production at the LHC}},
  url          = {{http://dx.doi.org/10.1007/JHEP08(2020)082}},
  doi          = {{10.1007/JHEP08(2020)082}},
  volume       = {{2020}},
  year         = {{2020}},
}