Measurement of differential cross sections for the production of a pair of isolated photons in pp collisions at sqrt(s) = 7 TeV

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Issue Date
2014-11-12Author
CMS Collaboration
Bean, Alice
Publisher
Springer Verlag
Type
Article
Article Version
Scholarly/refereed, publisher version
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A measurement of differential cross sections for the production of a pair of isolated photons in proton–proton collisions at s√=7TeV is presented. The data sample corresponds to an integrated luminosity of 5.0fb−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 25GeV respectively, in the pseudorapidity range |η|<2.5, |η|∉[1.44,1.57] and with an angular separation ΔR>0.45, is 17.2±0.2(stat)±1.9(syst)±0.4(lumi) \,pb. Differential cross sections are measured as a function of the diphoton invariant mass, the diphoton transverse momentum, the azimuthal angle difference between the two photons, and the cosine of the polar angle in the Collins–Soper reference frame of the diphoton system. The results are compared to theoretical predictions at leading, next-to-leading, and next-to-next-to-leading order in quantum chromodynamics.
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Citation
CMS Collaboration. "Measurement of Differential Cross Sections for the Production of a Pair of Isolated Photons in Pp Collisions at S√=7TeV." The European Physical Journal C (2014): v74(11). http://dx.doi.org/10.1140/epjc/s10052-014-3129-3
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