Measurement of the production cross section for pairs of isolated photons in pp collisions at root s=7 TeV
JOURNAL OF HIGH ENERGY PHYSICS, no.1, 2012 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: Issue: 1
- Publication Date: 2012
- Doi Number: 10.1007/jhep01(2012)133
- Journal Name: JOURNAL OF HIGH ENERGY PHYSICS
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Istanbul University Affiliated: No
Abstract
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.