@article{3152254,
    title = "Measurement of the production cross section for pairs of isolated
photons in pp collisions at root s=7 TeV",
    author = "Chatrchyan, S. and Khachatryan, V. and Sirunyan, A. M. and Tumasyan, A. and and Adam, W. and Bergauer, T. and Dragicevic, M. and Eroe, J. and and Fabjan, C. and Friedl, M. and Fruehwirth, R. and Ghete, V. 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S. and and Grothe, M. and Hall-Wilton, R. and Herndon, M. and Herve, A. and and Klabbers, P. and Klukas, J. and Lanaro, A. and Lazaridis, C. and and Leonard, J. and Loveless, R. and Mohapatra, A. and Ojalvo, I. and and Pierro, G. A. and Ross, I. and Savin, A. and Smith, W. H. and Swanson, and J. and CMS Collaboration",
    journal = "Journal of High Energy Physics",
    year = "2012",
    number = "1",
    publisher = "Springer-Verlag",
    issn = "1126-6708, 1029-8479",
    doi = "10.1007/JHEP01(2012)133",
    keywords = "Hadron-Hadron Scattering",
    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."
}