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

Abstract

A measurement of the production of three isolated photons in proton-proton collisions at a centre-of-mass energy $\sqrt{s}$ = 8 TeV is reported. The results are based on an integrated luminosity of 20.2 fb${}^{-1}$ collected with the ATLAS detector at the LHC. The differential cross sections are measured as functions of the transverse energy of each photon, the difference in azimuthal angle and in pseudorapidity between pairs of photons, the invariant mass of pairs of photons, and the invariant mass of the triphoton system. A measurement of the inclusive fiducial cross section is also reported. Next-to-leading-order perturbative QCD predictions are compared to the cross-section measurements. The predictions underestimate the measurement of the inclusive fiducial cross section and the differential measurements at low photon transverse energies and invariant masses. They provide adequate descriptions of the measurements at high values of the photon transverse energies, invariant mass of pairs of photons, and invariant mass of the triphoton system.

36 pages in total, author list starting page 20, 3 figures, 2 tables, published in Physics Letters B. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2016-06

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• Triphoton production at hadron colliders in NNLO QCD
• Testing new physics models with global comparisons to collider measurements: the Contur toolkit
• Two-Loop QCD Corrections for Three-Photon Production at Hadron Colliders
• Evidence for the production of three massive vector bosons with the ATLAS detector
• Precision QCD Physics at the LHC
• Search for short- and long-lived axion-like particles in $H\to aa\to 4\gamma$ decays with the ATLAS experiment at the LHC
• Custodial Symmetry Breaking and Higgs Signatures at the LHC
• Three-photon productions within the $k_t$-factorization for the ATLAS-LHC data
• Electroweak, QCD and flavour physics studies with ATLAS data from Run 2 of the LHC
• Testing for observability of Higgs effective couplings in triphoton production at FCC-hh
• Sensitivity reach on anomalous Higgs couplings via triphoton production for the post-LHC circular high-energy hadron colliders
• Production of three isolated photons in the parton Reggeization approach at high energies
• Searching for Monopoles via Monopolium Multiphoton Decays