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...

Descripción completa

Guardado en:
Detalles Bibliográficos
Publicado: 2015
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03702693_v749_n_p242_Aad
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
id paper:paper_03702693_v749_n_p242_Aad
record_format dspace
spelling paper:paper_03702693_v749_n_p242_Aad2023-06-08T15:37:20Z 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 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. 2015 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03702693_v749_n_p242_Aad 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.
title Measurement of exclusive γγ→ℓ + ℓ − production in proton–proton collisions at √s=7 TeV with the ATLAS detector
spellingShingle 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
publishDate 2015
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03702693_v749_n_p242_Aad
http://hdl.handle.net/20.500.12110/paper_03702693_v749_n_p242_Aad
_version_ 1768541755275214848

Ejemplares similares