Measurement of exclusive gamma gamma -> l(+)l(-) production in proton-proton collisions at root s=7 TeV with the ATLAS detector



Aad, G, Collaboration, Atlas, Abdallah, J, Abdinov, O, Aben, R, Abolins, M, AbouZeid, OS, Abramowicz, H, Abreu, H, Abreu, R
et al (show 2840 more authors) (2015) Measurement of exclusive gamma gamma -> l(+)l(-) production in proton-proton collisions at root s=7 TeV with the ATLAS detector PHYSICS LETTERS B, 749. pp. 242-261. ISSN 0370-2693, 1873-2445

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Abstract

This Letter reports a measurement of the exclusive γγ→ℓ<sup>+</sup>ℓ<sup>−</sup> (ℓ=e, μ) cross-section in proton–proton collisions at a centre-of-mass energy of 7 TeV by the ATLAS experiment at the LHC, based on an integrated luminosity of 4.6 fb<sup>−1</sup>. For the electron or muon pairs satisfying exclusive selection criteria, a fit to the dilepton acoplanarity distribution is used to extract the fiducial cross-sections. The cross-section in the electron channel is determined to be σ<inf>γγ→e<sup>+</sup>e<sup>−</sup></inf> <sup>excl.</sup>=0.428 ± 0.035 (stat.) ± 0.018 (syst.) pb for a phase–space region with invariant mass of the electron pairs greater than 24 GeV, in which both electrons have transverse momentum p<inf>T</inf>>12 GeV and pseudorapidity |η|<2.4. For muon pairs with invariant mass greater than 20 GeV, muon transverse momentum p<inf>T</inf>>10 GeV and pseudorapidity |η|<2.4, the cross-section is determined to be σ<inf>γγ→μ<sup>+</sup>μ<sup>−</sup></inf> <sup>excl.</sup>=0.628 ± 0.032 (stat.) ± 0.021 (syst.) pb. When proton absorptive effects due to the finite size of the proton are taken into account in the theory calculation, the measured cross-sections are found to be consistent with the theory prediction.

Item Type: Article
Additional Information: 12 pages + references + author list + cover pages (34 pages total), 4 figures, 3 tables, submitted to Phys. Lett. B, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2014-13/
Uncontrolled Keywords: hep-ex, hep-ex
Depositing User: Symplectic Admin
Date Deposited: 24 Nov 2017 08:30
Last Modified: 22 May 2026 16:59
DOI: 10.1016/j.physletb.2015.07.069
Open Access URL: http://eprints.lancs.ac.uk/68134/1/art_3A10.1007_2...
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3012794
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