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https://hdl.handle.net/2440/123546
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Type: | Journal article |
Title: | Observation of Light-by-Light Scattering in Ultraperipheral Pb plus Pb Collisions with the ATLAS Detector |
Author: | Aad, G. Abbott, B. Abbott, D. Abdinov, O. Abud, A.A. Abeling, K. Abhayasinghe, D. Abidi, S. AbouZeid, O. Abraham, N. Abramowicz, H. Abreu, H. Abulaiti, Y. Acharya, B. Achkar, B. Adachi, S. Adam, L. Bourdarios, C.A. Adamczyk, L. Adamek, L. et al. |
Citation: | PHYSICAL REVIEW LETTERS, 2019; 123(5) |
Publisher: | AMER PHYSICAL SOC |
Issue Date: | 2019 |
ISSN: | 0031-9007 1079-7114 |
Abstract: | This Letter describes the observation of the light-by-light scattering process, γγ→γγ, in Pb+Pb collisions at sqrt[s_{NN}]=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 E_{T}^{γ}>3 GeV and pseudorapidity |η_{γ}|<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. |
Keywords: | ATLAS Collaboration |
DOI: | 10.1103/PhysRevLett.123.052001 |
Appears in Collections: | Physics publications |
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