Measurements of integrated and differential cross sections for isolated photon pair production in pp collisions at $\sqrt{s}=8$ TeV with the ATLAS detector

Abstract : A measurement of the production cross section for two isolated photons in proton--proton collisions at a center-of-mass energy of $\sqrt{s}=8$ TeV is presented. The results are based on an integrated luminosity of 20.2 fb$^{-1}$ recorded by the ATLAS detector at the Large Hadron Collider. The measurement considers photons with pseudorapidities satisfying $|\eta^{\gamma}|<1.37$ or ${1.56<|\eta^{\gamma}|<2.37}$ and transverse energies of respectively $E_{\mathrm{T,1}}^{\gamma}>40$ GeV and $E_{\mathrm{T,2}}^{\gamma}>30$ GeV for the two leading photons ordered in transverse energy produced in the interaction.The background due to hadronic jets and electrons is subtracted using data-driven techniques. The fiducial cross sections are corrected for detector effects and measured differentially as a function of six kinematic observables. The measured cross section integrated within the fiducial volume is $16.8 \pm 0.8$ pb. The data are compared to fixed-order QCD calculations at next-to-leading-order and next-to-next-to-leading-order accuracy as well as next-to-leading-order computations including resummation of initial-state gluon radiation at next-to-next-to-leading logarithm or matched to a parton shower, with relative uncertainties varying from 5% to 20%.
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Physical Review D, American Physical Society, 2017, 95, pp.112005. 〈https://journals.aps.org/prd/abstract/10.1103/PhysRevD.95.112005〉. 〈10.1103/PhysRevD.95.112005〉
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http://hal.in2p3.fr/in2p3-01507438
Contributeur : Claudine Bombar <>
Soumis le : jeudi 13 avril 2017 - 10:47:04
Dernière modification le : lundi 6 novembre 2017 - 12:46:01

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M. Aaboud, N. Berger, A.M. Burger, M. Delmastro, L. Di Ciaccio, et al.. Measurements of integrated and differential cross sections for isolated photon pair production in pp collisions at $\sqrt{s}=8$ TeV with the ATLAS detector. Physical Review D, American Physical Society, 2017, 95, pp.112005. 〈https://journals.aps.org/prd/abstract/10.1103/PhysRevD.95.112005〉. 〈10.1103/PhysRevD.95.112005〉. 〈in2p3-01507438〉

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