Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/123495
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Type: Journal article
Title: 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
Other Titles: 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
Author: Aaboud, M.
Aad, G.
Abbott, B.
Abbott, D.
Abdinov, O.
Abhayasinghe, D.
Abidi, S.
AbouZeid, O.
Abraham, N.
Abramowicz, H.
Abreu, H.
Abulaiti, Y.
Acharya, B.
Adachi, S.
Adam, L.
Adamczyk, L.
Adamek, L.
Adelman, J.
Adersberger, M.
Adiguzel, A.
et al.
Citation: Journal of High Energy Physics, 2019; 2019(4):093[1],1-093-46
Publisher: Springer Nature
Issue Date: 2019
ISSN: 1126-6708
1029-8479
Statement of
Responsibility: 
M. Aaboud ... D. Duvnjak ... P. Jackson ... J.L. Oliver ... A. Petridis ... A. Qureshi ... A.S. Sharma ... M.J. White ... et al. [The ATLAS Collaboration]
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.
Rights: 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.
RMID: 0030113474
DOI: 10.1007/JHEP04(2019)093
Appears in Collections:Physics publications

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