Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/63615
Título: | Observation of Light-by-Light Scattering in Ultraperipheral Pb+Pb Collisions with the ATLAS Detector |
Autor(es): | Onofre, A. Castro, Nuno Filipe ATLAS Collaboration |
Data: | 2019 |
Editora: | American Physical Society (APS) |
Revista: | Physical Review Letters |
Citação: | Aad, G., Abbott, B., Abbott, D. C., Abdinov, O., Abed Abud, A., Abeling, K., . . . Zwalinski, L. (2019). Observation of Light-by-Light Scattering in Ultraperipheral Pb+Pb Collisions with the ATLAS Detector. [Article]. Physical Review Letters, 123(5). doi: 10.1103/PhysRevLett.123.052001 |
Resumo(s): | This Letter describes the observation of the light-by-light scattering process, γγ→γγ, in Pb+Pb collisions at √sNN=5.02 TeV. The analysis is conducted using a data sample corresponding to an integrated luminosity of 1.73 nb−1, collected in November 2018 by the ATLAS experiment at the LHC. Light-by-light scattering candidates are selected in events with two photons produced exclusively, each with transverse energy EγT>3 GeV and pseudorapidity |ηγ|<2.4, diphoton invariant mass above 6 GeV, and small diphoton transverse momentum and acoplanarity. After applying all selection criteria, 59 candidate events are observed for a background expectation of 12±3 events. The observed excess of events over the expected background has a significance of 8.2 standard deviations. The measured fiducial cross section is 78±13(stat)±7(syst)±3(lumi) nb. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/63615 |
DOI: | 10.1103/PhysRevLett.123.052001 |
ISSN: | 0031-9007 |
e-ISSN: | 1079-7114 |
Versão da editora: | https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.123.052001 |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | LIP - Artigos/papers |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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PhysRevLett.123.052001.pdf | 431,75 kB | Adobe PDF | Ver/Abrir |