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

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 crit...

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Autor principal:	Aad, G.
Formato:	JOUR
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_03702693_v749_n_p242_Aad
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

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spelling	todo:paper_03702693_v749_n_p242_Aad2023-10-03T15:29:39Z Measurement of exclusive γγ→ℓ + ℓ − production in proton–proton collisions at √s=7 TeV with the ATLAS detector Aad, G. 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 γγ→e + e − excl. =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 γγ→μ + μ − excl. =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. © 2015 CERN for the benefit of the ATLAS Collaboration. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_03702693_v749_n_p242_Aad
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description	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 γγ→e + e − excl. =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 γγ→μ + μ − excl. =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. © 2015 CERN for the benefit of the ATLAS Collaboration.
format	JOUR
author	Aad, G.
spellingShingle	Aad, G. Measurement of exclusive γγ→ℓ + ℓ − production in proton–proton collisions at √s=7 TeV with the ATLAS detector
author_facet	Aad, G.
author_sort	Aad, G.
title	Measurement of exclusive γγ→ℓ + ℓ − production in proton–proton collisions at √s=7 TeV with the ATLAS detector
title_short	Measurement of exclusive γγ→ℓ + ℓ − production in proton–proton collisions at √s=7 TeV with the ATLAS detector
title_full	Measurement of exclusive γγ→ℓ + ℓ − production in proton–proton collisions at √s=7 TeV with the ATLAS detector
title_fullStr	Measurement of exclusive γγ→ℓ + ℓ − production in proton–proton collisions at √s=7 TeV with the ATLAS detector
title_full_unstemmed	Measurement of exclusive γγ→ℓ + ℓ − production in proton–proton collisions at √s=7 TeV with the ATLAS detector
title_sort	measurement of exclusive γγ→ℓ + ℓ − production in proton–proton collisions at √s=7 tev with the atlas detector
url	http://hdl.handle.net/20.500.12110/paper_03702693_v749_n_p242_Aad
work_keys_str_mv	AT aadg measurementofexclusivengllproductioninprotonprotoncollisionsats7tevwiththeatlasdetector
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Measurement of exclusive γγ→ℓ + ℓ − production in proton–proton collisions at √s=7 TeV with the ATLAS detector

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