Measurement of the isolated di-photon cross-section in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector

The ATLAS collaboration
Phys.Rev.D 85 (2012) 012003, 2012.

Abstract (data abstract)
CERN-LHC. The ATLAS experiment has measured the production cross-section of events with two isolated photons in the final state, in proton-proton collisions at sqrt(s) = 7 TeV. The full data set acquired in 2010 is used, corresponding to an integrated luminosity of 37 pb-1. The background, consisting of hadronic jets and isolated electrons, is estimated with fully data-driven techniques and subtracted. The differential cross-sections, as functions of the di-photon mass, total transverse momentum and azimuthal separation, are presented and compared to the predictions of next-to-leading-order QCD. Note added (27 JUN 2014): The cross section values reported in Tables 1-3 below should be multiplied by a factor of 1.0187 to take into account the updated value of the integrated luminosity for the ATLAS 2010 data taking period. The uncertainty on the global normalisation ("Lumi") increases slightly from 3.4% to 3.5%. See Eur.Phys.J. C73 (2013) 2518 for more details. Note that the Lumi uncertainty is added in the total systematic uncertainties, which are given in absolute value.

  • Table 1

    Data from T 1,F 7


    The measured differential cross section as a function of the invariant mass of the di-photon pair.

  • Table 2

    Data from T 1,F 8


    The measured differential cross section as a function of the transverse momentum of the di-photon pair.

  • Table 3

    Data from T 1,F 9


    The measured differential cross section as a function of the azimuthal angular separation of the photons in the di-photon pair.

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