Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/48921
Título: | Evidence for light-by-light scattering in heavy-ion collisions with the ATLAS detector at the LHC |
Autor(es): | Onofre, A. Castro, Nuno Filipe ATLAS Collaboration |
Palavras-chave: | Experimental nuclear physics Experimental particle physics |
Data: | 2017 |
Editora: | Nature Publishing Group |
Revista: | Nature Physics |
Citação: | 63. Aaboud, M., Aad, G., Abbott, B., Abdallah, J., Abdinov, O., Abeloos, B., . . . Zwalinski, L. (2017). Evidence for light-by-light scattering in heavy-ion collisions with the ATLAS detector at the LHC. [Article]. Nature Physics, 13(9), 852-858. doi: 10.1038/nphys4208 |
Resumo(s): | 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. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/48921 |
DOI: | 10.1038/nphys4208 |
ISSN: | 1745-2473 |
e-ISSN: | 1745-2481 |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | LIP - Artigos/papers |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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nphys4208.pdf | 671,17 kB | Adobe PDF | Ver/Abrir |
Este trabalho está licenciado sob uma Licença Creative Commons