Evidence for light-by-light scattering in heavy-ion collisions with the ATLAS detector at the LHC

Light-by-light scattering (γγ → γγ) is a quantum-mechanical process that is forbidden in the classical theory of electrodynamics. This reaction is accessible at the Large Hadron Collider thanks to the large electromagnetic field strengths generated by ultra-relativistic colliding lead ions. Using 48...

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Autor principal: Aaboud, M.
Formato: JOUR
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_17452473_v13_n9_p852_Aaboud
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_17452473_v13_n9_p852_Aaboud2023-10-03T16:31:56Z Evidence for light-by-light scattering in heavy-ion collisions with the ATLAS detector at the LHC Aaboud, M. Light-by-light scattering (γγ → γγ) is a quantum-mechanical process that is forbidden in the classical theory of electrodynamics. This reaction is accessible at the Large Hadron Collider thanks to the large electromagnetic field strengths generated by ultra-relativistic colliding lead ions. Using 480 μ 1 of lead-lead collision data recorded at a centre-of-mass energy per nucleon pair of 5.02 TeV by the ATLAS detector, here we report evidence for light-by-light scattering. A total of 13 candidate events were observed with an expected background of 2.6 ± 0.7 events. After background subtraction and analysis corrections, the fiducial cross-section of the process Pb + Pb (γγ) → Pb (∗) + Pb (∗) γγ ,for photon transverse energy E T > 3GeV, photon absolute pseudorapidity |η| <2.4, diphoton invariant mass greater than 6GeV, diphoton transverse momentum lower than 2GeV and diphoton acoplanarity below 0.01, is measured to be 70 ± 24 (stat.) ±17 (syst.) nb, which is in agreement with the standard model predictions. © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_17452473_v13_n9_p852_Aaboud
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description Light-by-light scattering (γγ → γγ) is a quantum-mechanical process that is forbidden in the classical theory of electrodynamics. This reaction is accessible at the Large Hadron Collider thanks to the large electromagnetic field strengths generated by ultra-relativistic colliding lead ions. Using 480 μ 1 of lead-lead collision data recorded at a centre-of-mass energy per nucleon pair of 5.02 TeV by the ATLAS detector, here we report evidence for light-by-light scattering. A total of 13 candidate events were observed with an expected background of 2.6 ± 0.7 events. After background subtraction and analysis corrections, the fiducial cross-section of the process Pb + Pb (γγ) → Pb (∗) + Pb (∗) γγ ,for photon transverse energy E T > 3GeV, photon absolute pseudorapidity |η| <2.4, diphoton invariant mass greater than 6GeV, diphoton transverse momentum lower than 2GeV and diphoton acoplanarity below 0.01, is measured to be 70 ± 24 (stat.) ±17 (syst.) nb, which is in agreement with the standard model predictions. © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved.
format JOUR
author Aaboud, M.
spellingShingle Aaboud, M.
Evidence for light-by-light scattering in heavy-ion collisions with the ATLAS detector at the LHC
author_facet Aaboud, M.
author_sort Aaboud, M.
title Evidence for light-by-light scattering in heavy-ion collisions with the ATLAS detector at the LHC
title_short Evidence for light-by-light scattering in heavy-ion collisions with the ATLAS detector at the LHC
title_full Evidence for light-by-light scattering in heavy-ion collisions with the ATLAS detector at the LHC
title_fullStr Evidence for light-by-light scattering in heavy-ion collisions with the ATLAS detector at the LHC
title_full_unstemmed Evidence for light-by-light scattering in heavy-ion collisions with the ATLAS detector at the LHC
title_sort evidence for light-by-light scattering in heavy-ion collisions with the atlas detector at the lhc
url http://hdl.handle.net/20.500.12110/paper_17452473_v13_n9_p852_Aaboud
work_keys_str_mv AT aaboudm evidenceforlightbylightscatteringinheavyioncollisionswiththeatlasdetectoratthelhc
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