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Measurements of integrated and differential cross sections for isolated photon pair production in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector

The ATLAS collaboration
Phys.Rev.D 95 (2017) 112005, 2017.

Abstract (data abstract)
CERN-LHC. A measurement of the production cross section for two isolated photons in proton--proton collisions at a centre-of-mass energy of $\sqrt{s}=8$~TeV is presented. The results are based on an integrated luminosity of 20.2~fb$^{-1}$ recorded by the ATLAS detector at the Large Hadron Collider. The measurement considers photons with pseudorapidities satisfying $|\eta^{\gamma}|<1.37$ or ${1.56<|\eta^{\gamma}|<2.37}$ and transverse energies of respectively $E_{\mathrm{T,1}}^{\gamma}>$ 40~GeV and $E_{\mathrm{T,2}}^{\gamma}>$ 30~GeV for the two leading photons ordered in transverse energy produced in the interaction. The background due to hadronic jets and electrons is subtracted using data-driven techniques. The fiducial cross sections are corrected for detector effects and measured differentially as a function of six kinematic observables. Fiducial volume definition: - At least two 2 photons not coming from hadron or $\tau$ decays - pT(photon_1) > 40 GeV, pT(photon_2) > 30 GeV - |eta(photons)| < 2.37 and not within 1.37 < |eta(photons)| < 1.56 - ETiso(photons) < 11 GeV - deltaR(photon_1,photon_2) > 0.4

  • Table 1


    The measured fiducial (total xs).

  • Table 2


    The measured differential as a function of Mgg.

  • Table 3


    The measured differential as a function of pTgg.

  • Table 4


    The measured differential as a function of aT.

  • Table 5


    The measured differential as a function of phiStarEta.

  • Table 6


    The measured differential as a function of abs(cosThetaStarEta).

  • Table 7


    The measured differential as a function of deltaPhi.

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