Measurement of the production cross section for pairs of isolated photons in pp collisions at <span class="latex"><span class="ss">ace="symbol">脰s = 7 TeVspan><span class="cs"><span class="math"> \sqrt {s} = 7\;TeV span>
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摘要
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 7 TeV 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 Dj <~2.8 \Delta \varphi \lesssim 2.8 rad.

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