Measurement of Exclusive γγ → ℓ⁺ℓ⁻ Production in Proton-Proton Collisions at √s̅ =7 TeV with the ATLAS Detector

DSpace/Manakin Repository

Measurement of Exclusive γγ → ℓ⁺ℓ⁻ Production in Proton-Proton Collisions at √s̅ =7 TeV with the ATLAS Detector

Show full item record

Title: Measurement of Exclusive γγ → ℓ⁺ℓ⁻ Production in Proton-Proton Collisions at √s̅ =7 TeV with the ATLAS Detector
Author(s):
Aad, G.;
Abdallah, J.;
Abdinov, O.;
Aben, R.;
Abolins, M.;
AbouZeid, O. S.;
Abramowicz, H.;
Izen, Joseph M.;
Leyton, Michael;
Meirose, Bernhard;
Namasivayam, Harisankar;
Reeves, Kendall;
ATLAS Collaboration
Date Created: 2015-07-31
Item Type: Article
Keywords: Show Keywords
Abstract: This Letter reports a measurement of the exclusive γγ → ℓ⁺ℓ⁻ (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⁻¹. 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(^(excl) / γγ →e⁺e⁻) = 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(T) > 12 GeV and pseudorapidity |η| < 2.4. For muon pairs with invariant mass greater than 20 GeV, muon transverse momentum p(T) > 10 GeV and pseudorapidity |η| < 2.4, the cross section is determined to be σ(^(excl) / γγ → μ⁺μ⁻) = 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.
Publisher: Elsevier Science BV
ISSN: 0370-2693
Source: Physics Letters B
Link to Related Resource: http://dx.doi.org/10.1016/j.physletb.2015.07.069
Persistent Link: http://hdl.handle.net/10735.1/4876
Bibliographic Citation: Aad, G., Atlas Collaboration, J. Abdallah, O. Abdinov, et al. 2015. "Measurement of exclusive γγ → ℓ⁺ℓ⁻ production in proton-proton collisions at √s̅=7 TeV with the ATLAS detector." Physics Letters B 749, doi: 10.1016/j.physletb.2015.07.069.
Terms of Use: CC BY 4.0 (Attribution)
©2015 CERN, for the ATLAS Collaboration

Files in this item

Files Size Format View
NSM-2307-273969.23.pdf 1.508Mb PDF View/Open Article

This item appears in the following Collection(s)


Show full item record

CC BY 4.0 (Attribution) Except where otherwise noted, this item's license is described as CC BY 4.0 (Attribution)