Advanced

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 ; 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)
Please use this url to cite or link to this publication:
author
, et al. (More)
(Less)
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
id
187a5940-52ef-48e0-ac55-915eb189bfd3
date added to LUP
2017-11-28 14:23:03
date last changed
2018-09-23 04:53:45
@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 and , },
  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},
  volume       = {13},
  year         = {2017},
}