Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/123588
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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
RMID: 0030133464
DOI: 10.1103/PhysRevLett.123.052001
Appears in Collections:Physics publications

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