Measurement of Differential Cross Sections for the Production of a Pair of Isolated Photons in Pp Collisions at $$\sqrt{s}

Measurement of Differential Cross Sections for the Production of a Pair of Isolated Photons in Pp Collisions at $$\sqrt{s}
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Total Pages: 3170
Release: 2014
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A measurement of differential cross sections for the production of a pair of isolated photons in proton-proton collisions at $\sqrt{s}=7\, \text {TeV} $ is presented. The data sample corresponds to an integrated luminosity of 5.0 $\, \text {fb}^{-1}$ collected with the CMS detector. A data-driven isolation template method is used to extract the prompt diphoton yield. The measured cross section for two isolated photons, with transverse energy above 40 and 25 $\, \text {GeV}$ respectively, in the pseudorapidity range $

Measurement of the Production Cross Section for Pairs of Isolated Photons in Pp Collisions at Sqrt(s)

Measurement of the Production Cross Section for Pairs of Isolated Photons in Pp Collisions at Sqrt(s)
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Total Pages: 38
Release: 2012
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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 inverse picobarns 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 approximately 2.8.