Measurement of isolated-photon pair production in pp collisions at √s = 7 TeV with the ATLAS detector
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(Published version)
Date
2013
Authors
The ATLAS Collaboration,
Aad, G.
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Journal article
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The Journal of High Energy Physics, 2013; 2013(1):086-1-086-41
Statement of Responsibility
G. Aad … P. Jackson … L. Lee … A Petridis … N. Soni … M.J. White … et al. [The ATLAS Collaboration]
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Abstract
<jats:title>A<jats:sc>bstract</jats:sc></jats:title><jats:p>The ATLAS experiment at the LHC has measured the production cross section of events with two isolated photons in the final state, in proton-proton collisions at<jats:inline-formula><jats:tex-math>$ \sqrt{s}=7\;\mathrm{TeV} $</jats:tex-math></jats:inline-formula>. The full data set collected in 2011, corresponding to an integrated luminosity of 4<jats:italic>.</jats:italic>9 fb<jats:sup>−1</jats:sup>, is used. The amount of background, from hadronic jets and isolated electrons, is estimated with data-driven techniques and subtracted. The total cross section, for two isolated photons with transverse energies above 25 GeV and 22 GeV respectively, in the acceptance of the electromagnetic calorimeter (|<jats:italic>η</jats:italic>| <jats:italic><</jats:italic> 1<jats:italic>.</jats:italic>37 and 1<jats:italic>.</jats:italic>52 <jats:italic><</jats:italic> |<jats:italic>η</jats:italic>| <jats:italic><</jats:italic> 2<jats:italic>.</jats:italic>37) and with an angular separation Δ<jats:italic>R ></jats:italic> 0<jats:italic>.</jats:italic>4, is<jats:inline-formula><jats:tex-math>$ 44.0_{-4.2}^{+3.2 } $</jats:tex-math></jats:inline-formula>pb. The differential cross sections as a function of the di-photon invariant mass, transverse momentum, azimuthal separation, and cosine of the polar angle of the largest transverse energy photon in the Collins-Soper di-photon rest frame are also measured. The results are compared to the prediction of leading-order parton-shower and next-to-leading-order and next-to-next-to-leading-order parton-level generators.</jats:p>
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Open Access, Copyright CERN, for the benefit of the ATLAS collaboration. This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.