Measurement of the differential isolated diphoton production cross section in pp collisions at sqrt(s) = 7 TeV with the CMS detector

Collaboration
2013
26 pages
Report number:
  • CMS-PAS-SMP-13-001
Experiments:

Citations per year

201320142015312
Abstract:
The measurement of the isolated diphoton production cross section in pp collisions at s\sqrt{s}~=~7~\TeV is presented. The dataset corresponds to an integrated luminosity of 5.0~fb1^{-1} collected by the CMS experiment in the year 2011. A new data-driven method to extract the prompt diphoton yield is used, based on the photon component of the particle-flow isolation. The measured cross section for two isolated photons with transverse momentum above 40 GeV and 25 GeV respectively, in the acceptance η<2.5,η[1.44,1.57]|\eta| < 2.5, |\eta| \notin [1.44,1.57] and with an angular separation ΔR>0.45\Delta R > 0.45, is (16.8±1.8)(16.8\pm 1.8) pb. The cross section is measured differentially as a function of the diphoton invariant mass, the diphoton transverse momentum, the azimuthal angle difference between the two photons, and the cosine of the polar angle in the Collins-Soper frame of the diphoton pair. Results are compared to theory predictions at leading, next-to-leading and next-to-next-to-leading order for diphoton production.
Note:
  • Preliminary results
  • Data
  • differential cross section: measured
  • p p: scattering
  • higher-order: 2
  • higher-order: 1
  • two-photon
  • transverse momentum dependence
  • photon: isolated production
  • CMS
  • particle flow