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

Abstract

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 sqrt(s) = 7 TeV. The full data set collected in 2011, corresponding to an integrated luminosity of 4.9 fb-1, 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 (|eta|<1.37 and 1.52<|eta|<2.37) and with an angular separation Delta R>0.4, is 44.0 (+3.2) (-4.2) 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.

24 pages plus author list (45 pages total), 5 figures, 5 tables, submitted to JHEP. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2012-05/ Revision matches published version

References in corpus (9)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• Parton distributions for the LHC
• New parton distributions for collider physics
• Event generation with SHERPA 1.1
• The Catchment Area of Jets
• Improved luminosity determination in pp collisions at sqrt(s) = 7 TeV using the ATLAS detector at the LHC
• Parton Distributions for LO Generators
• Parton Distributions for LHC

Cited by in corpus (66)

• Massive Gravity
• Event Generation with Sherpa 2.2
• Exotic Decays of the 125 GeV Higgs Boson
• Measurement of Higgs boson production in the diphoton decay channel in $pp$ collisions at center-of-mass energies of 7 and 8 TeV with the ATLAS detector
• Feebly-Interacting Particles:FIPs 2020 Workshop Report
• LHC probes the hidden sector
• Predictions for diphoton production at the LHC through NNLO in QCD
• Search for resonances in diphoton events at $\sqrt{s}$=13 TeV with the ATLAS detector
• The High Quality QCD Axion and the LHC
• Measurement of the photon identification efficiencies with the ATLAS detector using LHC Run-1 data
• Non-Resonant Searches for Axion-Like Particles at the LHC
• Measurement of the inclusive isolated prompt photon cross section in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector using 4.6 fb-1
• Measurement of differential cross sections for the production of a pair of isolated photons in pp collisions at sqrt(s) = 7 TeV
• Multi-Boson Interactions at the LHC
• Gravitational waves in bigravity cosmology
• The coupling to matter in Massive, Bi- and Multi-Gravity
• A practical guide to event generation for prompt photon production
• Search for photonic signatures of gauge-mediated supersymmetry in 8 TeV $pp$ collisions with the ATLAS detector
• Search for resonances decaying into photon pairs in 139 fb${}^{-1}$ of $pp$ collisions at $\sqrt{s}=$ 13 TeV with the ATLAS detector
• Isolating Prompt Photons with Narrow Cones
• Testing new physics models with global comparisons to collider measurements: the Contur toolkit
• Search for heavy resonances decaying to a $Z$ boson and a photon in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Dipolar Dark Matter with Massive Bigravity
• Search for dark matter in association with a Higgs boson decaying to two photons at $\sqrt{s}$= 13 TeV with the ATLAS detector
• Triphoton production at hadron colliders
• Measuring the 2HDM Scalar Potential at LHC14
• Search for dark matter in events with missing transverse momentum and a Higgs boson decaying into two photons in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Measurement of the production cross section of three isolated photons in $pp$ collisions at $\sqrt{s}$ = 8 TeV using the ATLAS detector
• Photon-jet events as a probe of axion-like particles at the LHC
• Probing axion-like particles with $\gamma \gamma$ final states from vector boson fusion processes at the LHC
• Measurements of integrated and differential cross sections for isolated photon pair production in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
• Diphoton production at Tevatron and the LHC in the NLO* approximation of the Parton Reggeization Approach
• New massive bigravity cosmologies with double matter coupling
• Search for direct production of electroweakinos in final states with missing transverse momentum and a Higgs boson decaying into photons in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Probing top quark electromagnetic dipole moments in single-top-plus-photon production
• Probing Anomalous FCNC Top-Higgs Yukawa Couplings at the Large Hadron Electron Collider
• Production of axion-like particles via vector boson fusion at future electron-positron colliders
• Collider constraints on axion-like particles
• Giant wormholes in ghost-free bigravity theory
• Exploring new possibilities to discover a light pseudo-scalar at LHCb
• On Partially Massless Theory in 3 Dimensions
• Searching for axion-like particles with data scouting at ATLAS and CMS
• Measurement of $Z\gamma \gamma$ production in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Measurement of differential cross sections of isolated-photon plus heavy-flavour jet production in pp collisions at $\sqrt{s}=8$ TeV using the ATLAS detector
• Can the diphoton enhancement at 750 GeV be due to a neutral technipion?
• A detail study of the LHC and TEVATRON hadron-hadron prompt-photon pair production experiments in the angular ordering constraint k_t-factorization approaches
• Galileons Coupled to Massive Gravity: General Analysis and Cosmological Solutions
• Translation invariant time-dependent solutions to massive gravity
• Exploring Peaks and Valleys in the Diphoton Spectrum
• Studies of Quantum Chromodynamics at the LHC
• Four photon production at the LHC: an application of 2->4 analytic unitarity
• Diphoton production at hadron colliders: transverse-momentum resummation at next-to-next-to-leading logarithmic accuracy
• Primordial fluctuations from inflation in dRGT bimetric theory of gravity
• Production of three isolated photons in the parton Reggeization approach at high energies
• On the challenge of estimating diphoton backgrounds at large invariant mass
• Consistent simulation of non-resonant diphoton production in hadron collisions including associated jet production up to two jets
• Master Integrals for Electroweak corrections to $gg\to \gamma \gamma$ -- Light quark contributions
• The Diphoton $q_T$ spectrum at N${}^3$LL${}^{\prime }$+NNLO
• LHC constraints on dark matter with (130 GeV) gamma ray lines
• Predictions for the isolated diphoton production through NNLO in QCD and comparison to the 8 TeV ATLAS data
• Jet and photon physics
• LHC Results Highlights (CLASHEP 2013)
• GR@PPA 2.9: radiation matching for simulating photon production processes in hadron collisions
• Experimental Tests of QCD
• Interpreting the 750 GeV diphoton signal as technipion
• Recent QCD Results From ATLAS