Measurement of the production cross section for pairs of isolated photons in pp collisions at root s=7 TeV


Chatrchyan S., Khachatryan V., Sirunyan A. M. , Tumasyan A., Adam W., Bergauer T., ...Daha Fazla

JOURNAL OF HIGH ENERGY PHYSICS, sa.1, 2012 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: Konu: 1
  • Basım Tarihi: 2012
  • Doi Numarası: 10.1007/jhep01(2012)133
  • Dergi Adı: JOURNAL OF HIGH ENERGY PHYSICS

Özet

The integrated and differential cross sections for the production of pairs of isolated photons is measured in proton-proton collisions at a centre-of-mass energy of 7TeV with the CMS detector at the LHC. A data sample corresponding to an integrated luminosity of 36 pb(-1) is analysed. A next-to-leading-order perturbative QCD calculation is compared to the measurements. A discrepancy is observed for regions of the phase space where the two photons have an azimuthal angle difference Delta phi less than or similar to 2.8 rad.