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

by Okawa H. , Ukegawa F. , Hara K. , Kim S.H. , 受川史彦 , 原和彦 , 金信弘 , 大川英希 , ATLAS Collaboration , Sato K. , 佐藤構二

in 639/766/387/1126 / 639/766/419/1131 / Atomic / Chemical reactions / Chromatography / Classical and Continuum Physics / Collision dynamics / Collisions / Complex Systems / Condensed Matter Physics / Electrodynamics / Electromagnetic fields / Fysik / High Energy Physics - Experiment / Ionic collisions / Ions / Large Hadron Collider / Lead / Light / Light scattering / Mathematical and Computational Physics / Molecular / Natural Sciences / Naturvetenskap / Nuclear Experiment / Optical and Plasma Physics / Physical Sciences / Physics / Scattering / Subatomic Physics / Subatomär fysik / Subtraction / Theoretical / Transverse momentum

2017

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

by Okawa H. , Ukegawa F. , Hara K. , Kim S.H. , 受川史彦 , 原和彦 , 金信弘 , 大川英希 , ATLAS Collaboration , Sato K. , 佐藤構二

2017

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

by Okawa H. , Ukegawa F. , Hara K. , Kim S.H. , 受川史彦 , 原和彦 , 金信弘 , 大川英希 , ATLAS Collaboration , Sato K. , 佐藤構二

2017

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Journal Article

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

Okawa H.,

Ukegawa F.,

Hara K.,

Kim S.H.,

受川史彦,

原和彦,

金信弘,

大川英希,

ATLAS Collaboration,

Sato K.,

佐藤構二

2017

Overview

Light-by-light scattering (γγ right arrow 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 μb−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) right arrow Pb(∗) + Pb(∗)γγ, for photon transverse energy ET > 3 GeV, photon absolute pseudorapidity |η| < 2.4, diphoton invariant mass greater than 6 GeV, diphoton transverse momentum lower than 2 GeV 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.

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Publisher

Springer Nature,Nature Publishing Group UK,Nature Publishing Group,Nature Publishing Group [2005-....],Nature Publishing Group (NPG)

Subject

/ Atomic

/ Classical and Continuum Physics

/ Collision dynamics