# Measurement of differential cross sections for the production of a pair of isolated photons in pp collisions at $\sqrt{s}=7\,\text {TeV}$

CMS Collaboration; Chatrchyan, S; Khachatryan, V; Sirunyan, A M; Tumasyan, A; Canelli, M F; Chiochia, V; De Cosa, A; Hinzmann, A; Hreus, T; Ivova Rikova, M; Kilminster, B; Mejias, B; Ngadiuba, J; Robmann, P; Snoek, H; Taroni, S; Verzetti, M; Yang, Y; Amsler, C; Favaro, C; et al (2014). Measurement of differential cross sections for the production of a pair of isolated photons in pp collisions at $\sqrt{s}=7\,\text {TeV}$. European Physical Journal C - Particles and Fields, 74(3219):online.

## Abstract

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 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 GeV respectively, in the pseudorapidity range \eta|<2.5 , |η|∉[1.44,1.57] and with an angular separation >delta R>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.

## Abstract

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 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 GeV respectively, in the pseudorapidity range \eta|<2.5 , |η|∉[1.44,1.57] and with an angular separation >delta R>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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Item Type: Journal Article, refereed, original work 07 Faculty of Science > Physics Institute 530 Physics English 2014 12 Dec 2014 09:55 05 Apr 2016 18:38 Springer 1434-6044 Publisher DOI. An embargo period may apply. https://doi.org/10.1140/epjc/s10052-014-3129-3 http://arxiv.org/abs/1405.7225

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