Measurement of the ratio of cross sections for inclusive isolated-photon production in pp collisions at √s = 13 and 8 TeV with the ATLAS detector

The ATLAS collaboration

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Abstract

The ratio of the cross sections for inclusive isolated-photon production in pp collisions at centre-of-mass energies of 13 and 8 TeV is measured using the ATLAS detector at the LHC. The integrated luminosities of the 13 TeV and 8 TeV datasets are 3.2 fb −1 and 20.2 fb −1 , respectively. The ratio is measured as a function of the photon transverse energy in different regions of the photon pseudorapidity. The predictions from next-to-leading-order perturbative QCD calculations are compared with the measured ratio. The experimental systematic uncertainties as well as the uncertainties affecting the predictions are evaluated taking into account the correlations between the two centre-of-mass energies, resulting in a reduction of up to a factor of 2.5 (5) in the experimental (theoretical) systematic uncertainties. The predictions based on several parameterisations of the proton parton distribution functions agree with the data within the reduced experimental and theoretical uncertainties. In addition, this ratio to that of the fiducial cross sections for Z boson production at 13 and 8 TeV using the decay channels Z → e + e and Z → μ + μ is made and compared with the theoretical predictions. In this double ratio, a further reduction of the experimental uncertainty is obtained because the uncertainties arising from the luminosity measurement cancel out. The predictions describe the measurements of the double ratio within the theoretical and experimental uncertainties.[Figure not available: see fulltext.].

Original languageEnglish
Article number93
JournalJournal of High Energy Physics
Volume2019
Issue number4
DOIs
StatePublished - 1 Apr 2019

Funding

FundersFunder number
Not addedST/L006162/1, ST/N000307/1
AvH Foundation
BSF-NSF
Benoziyo Center, Israel
CEA-DRF/IRFU
Cantons of Bern and Geneva
DNSRCIN2P3-CNRS
DST/NRF
EU-ESF
Horizon 2020, and Marie Skl odowska-Curie Actions
MES of Russia
MESTD
MNE/IFA
MSMT
MSSR
RGC
VSC CR
National Science Foundation
U.S. Department of Energy
Departamento Administrativo de Ciencia, Tecnología e Innovación (COLCIENCIAS)
CERN
National Research Council
College of Arts and Sciences, University of Nebraska-Lincoln
Glycemic Index Foundation
Natural Sciences and Engineering Research Council of Canada
Science and Technology Facilities CouncilST/N000234/1
Leverhulme Trust
Royal Society
European Research Council
European Cooperation in Science and Technology
Singapore Eye Research Institute
Helmholtz-Gemeinschaft
Deutsche Forschungsgemeinschaft
Agence Nationale de la Recherche
Japan Society for the Promotion of Science
Ministry of Education, Culture, Sports, Science and Technology
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
Danmarks Grundforskningsfond
Canada Foundation for Innovation
National Natural Science Foundation of China
Fundação para a Ciência e a Tecnologia
Bundesministerium für Bildung und Forschung
Comisión Nacional de Investigación Científica y Tecnológica
Ministerstvo Zdravotnictví Ceské Republiky
Nederlandse Organisatie voor Wetenschappelijk Onderzoek
Ministerio de Economía y Competitividad
General Secretariat for Research and Technology
Ministry of Science and Technology
Joint Institute for Nuclear Research
Israel Science Foundation
Instituto Nazionale di Fisica Nucleare
Narodowe Centrum Nauki
Javna Agencija za Raziskovalno Dejavnost RS
Ministerstwo Nauki i Szkolnictwa Wyższego
Centre National pour la Recherche Scientifique et Technique
British Columbia Knowledge Development Fund
European Regional Development Fund
Institut Nacional d'Educacio Fisica de Catalunya, Generalitat de Catalunya
Marianne and Marcus Wallenberg Foundation
National Research Center "Kurchatov Institute"
Ministry of Health of the Russian Federation

    Keywords

    • Hadron-Hadron scattering (experiments)
    • Photon production
    • QCD

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