Abstract
A measurement of the cross section for the production of isolated prompt photons in pp collisions at a center-of-mass energy s=7 TeV is presented. The results are based on an integrated luminosity of 4.6 fb−1 collected with the ATLAS detector at the LHC. The cross section is measured as a function of photon pseudorapidity ηγ and transverse energy ETγ in the kinematic range 100≤ETγ<1000 GeV and in the regions |ηγ|<1.37 and 1.52≤|ηγ|<2.37. The results are compared to leading-order parton-shower Monte Carlo models and next-to-leading-order perturbative QCD calculations. Next-to-leading-order perturbative QCD calculations agree well with the measured cross sections as a function of ETγ and ηγ.Received 7 November 2013DOI:https://doi.org/10.1103/PhysRevD.89.052004This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.© 2014 CERN, for the ATLAS Collaboration
Highlights
Prompt photon production at hadron colliders allows tests of perturbative QCD predictions [1]
The measurement is sensitive to the gluon content of the proton through the qg → qγ process, which dominates the prompt photon production cross section at the LHC, and can be used to constrain parton distribution functions (PDFs) [2,3,4,5,6,7]
(2) The uncertainty on the differential cross section due to insufficient knowledge of the PDFs was obtained by repeating the JETPHOX calculation for 52 eigenvector sets of the CT10 PDF and applying a scaling factor in order to obtain the uncertainty for the 68% confidence-level (C.L.) interval [38]
Summary
Prompt photon production at hadron colliders allows tests of perturbative QCD predictions [1]. The measurement is sensitive to the gluon content of the proton through the qg → qγ process, which dominates the prompt photon production cross section at the LHC, and can be used to constrain parton distribution functions (PDFs) [2,3,4,5,6,7]. The differential cross section as a function of EγT is measured in the pseudorapidity [18] range jηγj < 1.37 (the barrel region) and 1.52 ≤ jηγj < 2.37 (the end-cap region). Photon reconstruction in these pseudorapidity regions has a high. The main background for the prompt photons consists of photons from decays of light neutral mesons such as the π0 or η
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