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

Aaboud, M ; Aad, G ; Abbott, B. ; Abdallah, J ; Abdinov, O ; Abeloos, B ; Åkesson, Torsten LU orcid ; Bocchetta, Simona LU ; BRYNGEMARK, LENE LU and Doglioni, Caterina LU , et al. (2017) In Nature Physics 13(9). p.852-858
Abstract
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 μ1 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 ET > 3GeV, photon... (More)
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 μ1 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 ET > 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. (Less)
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Nature Physics
volume
13
issue
9
pages
7 pages
publisher
Nature Publishing Group
external identifiers
  • scopus:85028933316
ISSN
1745-2473
DOI
10.1038/nphys4208
language
English
LU publication?
yes
additional info
Cited By :3 Export Date: 28 November 2017
id
187a5940-52ef-48e0-ac55-915eb189bfd3
date added to LUP
2017-11-28 14:23:03
date last changed
2023-04-08 02:38:03
@article{187a5940-52ef-48e0-ac55-915eb189bfd3,
  abstract     = {{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 μ1 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 ET &gt; 3GeV, photon absolute pseudorapidity |η| &lt;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.}},
  author       = {{Aaboud, M and Aad, G and Abbott, B. and Abdallah, J and Abdinov, O and Abeloos, B and Åkesson, Torsten and Bocchetta, Simona and BRYNGEMARK, LENE and Doglioni, Caterina and Hedberg, Vincent and Jarlskog, Göran and Kalderon, Charles and Mjörnmark, Ulf and Smirnova, Oxana and Viazlo, Oleksandr}},
  issn         = {{1745-2473}},
  language     = {{eng}},
  number       = {{9}},
  pages        = {{852--858}},
  publisher    = {{Nature Publishing Group}},
  series       = {{Nature Physics}},
  title        = {{Evidence for light-by-light scattering in heavy-ion collisions with the ATLAS detector at the LHC}},
  url          = {{http://dx.doi.org/10.1038/nphys4208}},
  doi          = {{10.1038/nphys4208}},
  volume       = {{13}},
  year         = {{2017}},
}