Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/123589
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Type: Journal article
Title: Observation of light-by-light scattering in ultraperipheral Pb + Pb collisions with the ATLAS detector
Other Titles: 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):052001-1-052001-21
Publisher: American Physical Society
Issue Date: 2019
ISSN: 0031-9007
1079-7114
Statement of
Responsibility: 
G. Aad ... D. Duvnjak ... P. Jackson ... J.L. Oliver ... A. Petridis ... A. Qureshi ... A.S. Sharma ... M.J. White ... et al. [The ATLAS Collaboration]
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
Rights: © 2019 CERN, for the ATLAS Collaboration. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP³.
RMID: 0030133464
DOI: 10.1103/PhysRevLett.123.052001
Appears in Collections:Physics publications

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