Measurement of the production cross section of three isolated photons in $pp$ collisions at $\sqrt{s}$ = 8 TeV using the ATLAS detector

The ATLAS collaboration
Aaboud, Morad , Aad, Georges , Abbott, Brad , Abdinov, Ovsat , Abeloos, Baptiste , Abidi, Syed Haider , AbouZeid, Ossama , Abraham, Nicola , Abramowicz, Halina , Abreu, Henso
Phys.Lett.B 781 (2018) 55-76, 2018.

Abstract (data abstract)
CERN-LHC. Measurement of the production cross section of three isolated photons in pp collisions at 8 TeV with the ATLAS detector. The three isolated photon fiducial region is defined as: - ET(Photon1) > 27 GeV, ET(Photon2) > 22 GeV, ET(Photon3) > 15 GeV - dR(Photon-Photon) > 0.45 - M(photon,photon,photon) > 50 GeV - |Eta(Photon)| < 2.37 ( 1.37 < |Eta(Photon)| < 1.56 excluded) - Photon Isolation in DeltaR-Cone of 0.4: ETIso < 10 GeV. At particle level it is the sum of transverse energy from all particles, except for muons, neutrinos and the photon itself. At parton level it is the sum of energy from all coloured partons.

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