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Article Dans Une Revue Nature Physics Année : 2017

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

M. Aaboud , N. Berger (1) , A.M. Burger (1) , M. Delmastro (1) , L. Di Ciaccio (1) , S. Elles (1) , K. Grevtsov (1) , T. Guillemin (1) , T. Hryn’ova (1) , S. Jézéquel (1) , O. Kivernyk (1) , I. Koletsou (1) , R. Lafaye (1) , Jérémy Lévêque (1) , N. Lorenzo Martinez (1) , P. Mastrandea (1) , E. Sauvan (1) , B.H. Smart (1) , S. Todorova-Nova (1) , A. Vallier (1) , I. Wingerter-Seez (1) , E. Yatsenko (1) , S. Berlendis (2) , C. Camincher (2) , J. Collot (2) , S. Crépé-Renaudin (2) , P.A. Delsart (2) , C. Gabaldon (2) , M.H. Genest (2) , J.Y. Hostachy (2) , F. Ledroit-Guillon (2) , A. Lleres (2) , A. Lucotte (2) , F. Malek (2) , T. Meideck (2) , E. Petit (2) , J. Stark (2) , B. Trocmé (2) , D. Boumediene (3) , E. Busato (3) , D. Calvet (3) , S. Calvet (3) , A.R. Chomont (3) , J. Donini (3) , S. Ganguly (3) , Ph. Gris (3) , R. Madar (3) , M. Marjanovic (3) , D. Pallin (3) , S.M. Romano Saez (3) , C. Santoni (3) , F. Vazeille (3) , G. Aad (4) , M. Alstaty (4) , M. Barbero (4) , A. Calandri (4) , T.P. Calvet (4) , Y. Coadou (4) , K. de Vasconcelos Corga (4) , C. Diaconu (4) , R. El Kosseifi (4) , V. Ellajosyula (4) , F. Djama (4) , L. Feligioni (4) , A. Hadef (4) , G.D. Hallewell (4) , F. Hubaut (4) , S.J. Kahn (4) , E. B. F. G. Knoops (4) , R. Kukla (4) , E. Le Guirriec (4) , K. Liu (4) , D. Madaffari (4) , E. Monnier (4) , S. Muanza (4) , E. Nagy (4) , P. Pralavorio (4) , Y. Rodina (4) , A. Rozanov (4) , M. Talby (4) , T. Theveneaux-Pelzer (4) , R.E. Ticse Torres (4) , S. Tisserant (4) , J. Toth (5, 4) , F. Touchard (4) , L. Vacavant (4) , R. Wolff (4)
M. Aaboud
  • Fonction : Auteur
N. Berger
T. Hryn’ova
S. Calvet
G. Aad
Y. Coadou

Résumé

Light-by-light scattering ($\gamma\gamma\rightarrow\gamma\gamma$) 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 (Pb) ions. Using 480 $\mu$b$^{-1}$ of Pb+Pb collision data recorded at a centre-of-mass energy per nucleon pair of 5.02 TeV by the ATLAS detector, the ATLAS Collaboration reports evidence for the $\gamma\gamma\rightarrow\gamma\gamma$ reaction. A total of 13 candidate events are observed with an expected background of 2.6$\pm$0.7 events. After background subtraction and analysis corrections, the fiducial cross section of the process $\textrm{Pb+Pb}\,(\gamma\gamma)\rightarrow\textrm{Pb}^{(\ast)}\textrm{+}\textrm{Pb}^{(\ast)}\,\gamma\gamma$, for photon transverse energy $E_{\mathrm{T}}>$3 GeV, photon absolute pseudorapidity $|\eta|<$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 $\pm$ 24 (stat.) $\pm$ 17 (syst.) nb, which is in agreement with Standard Model predictions.
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Dates et versions

in2p3-01458929 , version 1 (24-07-2020)

Identifiants

Citer

M. Aaboud, N. Berger, A.M. Burger, M. Delmastro, L. Di Ciaccio, et al.. Evidence for light-by-light scattering in heavy-ion collisions with the ATLAS detector at the LHC. Nature Physics, 2017, 13, pp.852-858. ⟨10.1038/nphys4208⟩. ⟨in2p3-01458929⟩
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