Artículo
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.; Alconada Verzini, María Josefina
; Alonso, Francisco
; Arduh, Francisco Anuar
; Dova, Maria Teresa
; Hoya, Joaquín
; Monticelli, Fernando Gabriel
; Wahlberg, Hernan Pablo
; Bossio Sola, Jonathan David
; Marceca, Gino
; Otero y Garzon, Gustavo Javier
; Piegaia, Ricardo Nestor
; Sacerdoti, Sabrina
; Zibell. A.; Zieminska, D.; Zimine, N. I.; Zimmermann, C.; Zimmermann, S.; Zinonos, Z.; Zinser, M.; Ziolkowski, M.; Živković, L.; Zobernig, G.; Zoccoli, A.; Nedden, M. zur; Zurzolo, G.; Zwalinski, L.; The ATLAS Collaboration
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Fecha de publicación:
02/2017
Editorial:
Nature Publishing Group
Revista:
Nature Physics
ISSN:
1745-2473
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
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 (Pb) ions. Using 480 µb −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 γγ → γγ reaction. A total of 13 candidate events are 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 > 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 Standard Model predictions
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Articulos(IFLP)
Articulos de INST.DE FISICA LA PLATA
Articulos de INST.DE FISICA LA PLATA
Citación
Aaboud, M.; Aad, G.; Abbott, B.; Abdallah, J.; Abdinov, O.; et al.; Evidence for light-by-light scattering in heavy-ion collisions with the ATLAS detector at the LHC; Nature Publishing Group; Nature Physics; 13; 2-2017; 852–858
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