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Article: Observation of Light-by-Light Scattering in Ultraperipheral Pb + Pb Collisions with the ATLAS Detector

TitleObservation of Light-by-Light Scattering in Ultraperipheral Pb + Pb Collisions with the ATLAS Detector
Authors
KeywordsGermanium compounds
Light scattering
Issue Date2019
PublisherAmerican Physical Society. The Journal's web site is located at https://journals.aps.org/prl/
Citation
Physical Review Letters, 2019, v. 123 n. 5, p. article no. 052001 How to Cite?
AbstractThis 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 ETγ>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. © 2019 CERN.
Persistent Identifierhttp://hdl.handle.net/10722/275141
ISSN
2020 Impact Factor: 9.161
2020 SCImago Journal Rankings: 3.688
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorLO, CY-
dc.contributor.authorParedes Hernandez, D-
dc.contributor.authorTu, Y-
dc.contributor.authorATLAS Collaboration-
dc.date.accessioned2019-09-10T02:36:22Z-
dc.date.available2019-09-10T02:36:22Z-
dc.date.issued2019-
dc.identifier.citationPhysical Review Letters, 2019, v. 123 n. 5, p. article no. 052001-
dc.identifier.issn0031-9007-
dc.identifier.urihttp://hdl.handle.net/10722/275141-
dc.description.abstractThis 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 ETγ>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. © 2019 CERN.-
dc.languageeng-
dc.publisherAmerican Physical Society. The Journal's web site is located at https://journals.aps.org/prl/-
dc.relation.ispartofPhysical Review Letters-
dc.rightsPhysical Review Letters. Copyright © American Physical Society.-
dc.rightsCopyright [2019] by The American Physical Society. This article is available online at [http://dx.doi.org/10.1103/PhysRevLett.123.052001].-
dc.subjectGermanium compounds-
dc.subjectLight scattering-
dc.titleObservation of Light-by-Light Scattering in Ultraperipheral Pb + Pb Collisions with the ATLAS Detector-
dc.typeArticle-
dc.identifier.emailParedes Hernandez, D: dparedes@hku.hk-
dc.identifier.emailTu, Y: yanjuntu@hku.hk-
dc.identifier.authorityTu, Y=rp01971-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1103/PhysRevLett.123.052001-
dc.identifier.pmid31491300-
dc.identifier.scopuseid_2-s2.0-85071896312-
dc.identifier.hkuros304191-
dc.identifier.volume123-
dc.identifier.issue5-
dc.identifier.spagearticle no. 052001-
dc.identifier.epagearticle no. 052001-
dc.identifier.isiWOS:000479003100006-
dc.publisher.placeUnited States-
dc.identifier.issnl0031-9007-

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