Measurement of exclusive ɣɣ→l+l- production in proton-proton collisions at √s=7 TeV with the ATLAS detector

dc.contributor.authorATLAS Collaboration,
dc.date.issued2015
dc.descriptionL. Lee is a member of the ATLAS Collaboration
dc.description.abstractThis Letter reports a measurement of the exclusive γγ→ + −( =e,μ) cross-section in proton–proton collisions at a centre-of-mass energy of 7TeVby the ATLAS experiment at the LHC, based on an inte-grated luminosity of 4.6fb−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 σexcl.γγ→e+e−=0.428±0.035(stat.)±0.018(syst.)pbfor a phase–space region with invariant mass of the electron pairs greater than 24GeV, in which both electrons have transverse momentum pT>12GeVand pseudorapidity |η| <2.4. For muon pairs with invariant mass greater than 20GeV, muon transverse momentum pT>10GeVand pseudorapidity |η| <2.4, the cross-section is determined to be σexcl.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.
dc.description.statementofresponsibilityATLAS Collaboration
dc.identifier.citationPhysics Letters B, 2015; 749:242-261
dc.identifier.doi10.1016/j.physletb.2015.07.069
dc.identifier.issn0370-2693
dc.identifier.issn1873-2445
dc.identifier.urihttp://hdl.handle.net/2440/94074
dc.language.isoen
dc.publisherElsevier
dc.rights©2015 CERN for the benefit of the ATLAS Collaboration. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP3.
dc.source.urihttps://doi.org/10.1016/j.physletb.2015.07.069
dc.titleMeasurement of exclusive ɣɣ→l+l- production in proton-proton collisions at √s=7 TeV with the ATLAS detector
dc.title.alternativeMeasurement of exclusive gamma gamma ->l+l- production in proton-proton collisions at root s=7 TeV with the ATLAS detector
dc.typeJournal article
pubs.publication-statusPublished

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