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Measurements of integrated and differential cross sections for isolated photon pair production in pp collisions at root s=8 TeV with the ATLAS detector
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
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Number of Authors: 2859
2017 (English)In: Physical review D, ISSN 2470-0010, Vol. 95, no 11, 112005Article in journal (Refereed) Published
Abstract [en]

A measurement of the production cross section for two isolated photons in proton-proton collisions at a center-of-mass energy of root 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 vertical bar eta(gamma)vertical bar< 1.37 or 1.56 <vertical bar eta(gamma)vertical bar< 2.37 and transverse energies of respectively E-T,1(gamma) > 40 GeV and E-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 +/- 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%.

Place, publisher, year, edition, pages
2017. Vol. 95, no 11, 112005
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:uu:diva-331598DOI: 10.1103/PhysRevD.95.112005OAI: oai:DiVA.org:uu-331598DiVA: diva2:1149397
Note

ATLAS Collaboration, for complete list of authors see http://dx.doi.org/10.1103/PhysRevD.95.112005

Available from: 2017-10-16 Created: 2017-10-16 Last updated: 2017-10-16Bibliographically approved

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Bergeås, Elin KuutmannBokan, PeterBrenner, RichardEkelöf, TordEllert, MattiasFerrari, ArnaudGradin, P.O. JoakimIsacson, MaxMårtensson, MikaelÖhman, HenrikRangel-Smith, CamillaDe Bruin, Pedro Sales

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Bergeås, Elin KuutmannBokan, PeterBrenner, RichardEkelöf, TordEllert, MattiasFerrari, ArnaudGradin, P.O. JoakimIsacson, MaxMårtensson, MikaelÖhman, HenrikRangel-Smith, CamillaDe Bruin, Pedro Sales
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High Energy Physics
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