Measurement of the ratio of cross sections for inclusive isolated-photon production in pp collisions at root s=13 and 8 TeV with the ATLAS detector
Delitzsch, C. M.
Johns, K. A.
Rutherfoord, J. P.
Varnes, E. W.
AffiliationUniv Arizona, Dept Phys
MetadataShow full item record
CitationThe ATLAS collaboration, Aaboud, M., Aad, G. et al. J. High Energ. Phys. (2019) 2019: 93. https://doi.org/10.1007/JHEP04(2019)093
JournalJOURNAL OF HIGH ENERGY PHYSICS
RightsOpen Access, Copyright © CERN, for the benefit of the ATLAS Collaboration. Article funded by SCOAP3. This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at email@example.com.
AbstractThe 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 (+-) 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.
NoteOpen access journal
VersionFinal published version
SponsorsANPCyT, Argentina; YerPhI, Armenia; ARC, Australia; BMWFW Austria; FWF, Austria; ANAS, Azerbaijan; SSTC, Belarus; CNPq Brazil; FAPESP, Brazil; NSERC Canada; CFI, Canada; CONICYT, Chile; NSFC, China; COLCIENCIAS, Colombia; MSMT CR Czech Republic; MPO CR Czech Republic; VSC CR, Czech Republic; DNRF Denmark; DNSRC, Denmark; IN2P3-CNRS, France; BMBF Germany; MPG, Germany; GSRT, Greece; RGC, Hong Kong SAR, China; ISF Israel; Benoziyo Center, Israel; INFN, Italy; MEXT Japan; JSPS, Japan; CNRST, Morocco; RCN, Norway; MNiSW Poland; NCN, Poland; FCT, Portugal; MNE/IFA, Romania; NRC KI, Russian Federation; MESTD, Serbia; MSSR, Slovakia; ARRS Slovenia; MIZS, Slovenia; MINECO, Spain; Wallenberg Foundation, Sweden; SNSF Geneva, Switzerland; MOST, Taiwan; TAEK, Turkey; STFC, United Kingdom; DOE United States of America; NSF United States of America; BCKDF Canada; CANARIE Canada; COST; ERDF; Marie Sklodowska-Curie Actions, European Union; Investissements d' Avenir Labex and Idex; ANR, France; DFG; AvH Foundation, Germany; EU-ESF; Greek NSRF, Greece; BSF-NSF; GIF, Israel; CERCA Programme Generalitat de Catalunya, Spain; Royal Society; Leverhulme Trust, United Kingdom; NRC Canada; CERN; CAS China; MOST China; CEA-DRF/IRFU, France; SRNSFG, Georgia; HGF Germany; NWO, Netherlands; MES of Russia; JINR; DST/NRF, South Africa; SRC Sweden; SERI Geneva, Switzerland; Cantons of Bern and Geneva, Switzerland; CRC Canada; Compute Canada, Canada; ERC; Horizon 2020