Measurement of isolated-photon pair production in pppp collisions at s=7\sqrt{s}=7 TeV with the ATLAS detector

Collaboration
Nov, 2012
24 pages
Published in:
  • JHEP 01 (2013) 086
e-Print:
Report number:
  • CERN-PH-EP-2012-300
Experiments:

Citations per year

201220152018202120240510152025
Abstract: (Springer)
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 . 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 (|η| < 1.37 and 1.52 < |η| < 2.37) and with an angular separation ΔR > 0.4, is 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.
Note:
  • hadron-hadron scattering
  • higher-order: 2
  • photon: transverse energy
  • calorimeter: electromagnetic
  • higher-order: 1
  • higher-order: 0
  • jet: hadronic
  • p p: scattering
  • two-photon
  • ATLAS