Observation of single-top-quark production in association with a photon using the ATLAS detector

This Letter reports the observation of single top quarks produced together with a photon using 139 fb$^{-1}$ of 13 TeV proton-proton collision data collected with the ATLAS detector at the Large Hadron Collider. The analysis uses the presence of a forward jet, characteristic of $t$-channel productio...

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Detalles Bibliográficos
Autor principal: ATLAS Collaboration
Lenguaje:eng
Publicado: 2023
Materias:
Particle Physics - Experiment
Acceso en línea:http://cds.cern.ch/record/2848171
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author ATLAS Collaboration
author_facet ATLAS Collaboration
author_sort ATLAS Collaboration
collection CERN
description This Letter reports the observation of single top quarks produced together with a photon using 139 fb$^{-1}$ of 13 TeV proton-proton collision data collected with the ATLAS detector at the Large Hadron Collider. The analysis uses the presence of a forward jet, characteristic of $t$-channel production, and separates the signal from the background with neural networks. Requiring a photon with transverse momentum larger than 20 GeV and within the detector acceptance, the fiducial cross section is measured to be 688 $\pm$ 23 (stat.) $^{+75}_{-71}$ (syst.) fb, to be compared with the Standard Model prediction of 515 $^{+36}_{-42}$ fb at next-to-leading order in QCD.
id cern-2848171
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2023
record_format invenio
spelling cern-28481712023-07-24T03:06:50Zhttp://cds.cern.ch/record/2848171engATLAS CollaborationObservation of single-top-quark production in association with a photon using the ATLAS detectorParticle Physics - ExperimentThis Letter reports the observation of single top quarks produced together with a photon using 139 fb$^{-1}$ of 13 TeV proton-proton collision data collected with the ATLAS detector at the Large Hadron Collider. The analysis uses the presence of a forward jet, characteristic of $t$-channel production, and separates the signal from the background with neural networks. Requiring a photon with transverse momentum larger than 20 GeV and within the detector acceptance, the fiducial cross section is measured to be 688 $\pm$ 23 (stat.) $^{+75}_{-71}$ (syst.) fb, to be compared with the Standard Model prediction of 515 $^{+36}_{-42}$ fb at next-to-leading order in QCD.This Letter reports the observation of single top quarks produced together with a photon using 139 fb$^{-1}$ of 13 TeV proton-proton collision data collected with the ATLAS detector at the Large Hadron Collider. The analysis uses the presence of a forward jet, characteristic of $t$-channel production, and separates the signal from the background with neural networks. Requiring a photon with transverse momentum larger than 20 GeV and within the detector acceptance, the fiducial cross section is measured to be 688 $\pm$ 23 (stat.) $^{+75}_{-71}$ (syst.) fb, to be compared with the Standard Model prediction of 515 $^{+36}_{-42}$ fb at next-to-leading order in QCD.arXiv:2302.01283CERN-EP-2022-229oai:cds.cern.ch:28481712023-02-02
spellingShingle Particle Physics - Experiment
ATLAS Collaboration
Observation of single-top-quark production in association with a photon using the ATLAS detector
title Observation of single-top-quark production in association with a photon using the ATLAS detector
title_full Observation of single-top-quark production in association with a photon using the ATLAS detector
title_fullStr Observation of single-top-quark production in association with a photon using the ATLAS detector
title_full_unstemmed Observation of single-top-quark production in association with a photon using the ATLAS detector
title_short Observation of single-top-quark production in association with a photon using the ATLAS detector
title_sort observation of single-top-quark production in association with a photon using the atlas detector
topic Particle Physics - Experiment
url http://cds.cern.ch/record/2848171
work_keys_str_mv AT atlascollaboration observationofsingletopquarkproductioninassociationwithaphotonusingtheatlasdetector

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