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dc.contributor.authord'Enterria, D.
dc.contributor.authorSirunyan, A. M.
dc.contributor.authorIşıldak, Bora
dc.date.accessioned2020-08-20T12:49:33Z
dc.date.available2020-08-20T12:49:33Z
dc.date.issued2019-02
dc.identifier.issn0375-9474en_US
dc.identifier.urihttp://hdl.handle.net/10679/6796
dc.identifier.urihttps://www.sciencedirect.com/science/article/pii/S0375947418302914
dc.description.abstractEvidence for light-by-light (LbL) scattering, gamma gamma -> gamma gamma, in ultraperipheral PbPb collisions at a nucleon-nucleon center of-mass energy of 5.02 TeV is reported. LbL scattering processes are selected in events with just two photons produced, with transverse energy E-T(gamma) > 2 GeV, pseudorapidity vertical bar eta(gamma)vertical bar < 2.4; and diphoton invariant mass m(gamma gamma) > 5 GeV, transverse momentum p(T)(gamma gamma) < 1 GeV, and acoplanarity (1 - Delta phi(gamma gamma)/pi) < 0.01. After all selection criteria, 14 events are observed, compared to 11.1 +/- 1.1 (theo) and 3.8 +/- 1.3 (stat) events expected for signal and background processes respectively. The significance of the signal excess over the background-only hypothesis is 4.10 sigma. The measured fiducial LbL scattering cross section, sigma(fid)(gamma gamma -> gamma gamma) = 122 +/- 46 (stat) +/- 29 (syst) +/- 4 (theo) nb is consistent with the standard model prediction.en_US
dc.language.isoengen_US
dc.publisherElsevieren_US
dc.relation.ispartofNuclear Physics A
dc.rightsopenAccess
dc.titleEvidence for light-by-light scattering in ultraperipheral PbPb collisions at √sNN = 5.02 TeVen_US
dc.typeArticleen_US
dc.description.versionPublisher versionen_US
dc.peerreviewedyesen_US
dc.publicationstatusPublisheden_US
dc.contributor.departmentÖzyeğin University
dc.contributor.authorID(ORCID 0000-0002-0283-5234 & YÖK ID 124605) Işıldak, Bora
dc.contributor.ozuauthorIşıldak, Bora
dc.creatorThe CMS Collaboration
dc.identifier.volume982en_US
dc.identifier.startpage791en_US
dc.identifier.endpage794en_US
dc.identifier.wosWOS:000457515500183
dc.identifier.doi10.1016/j.nuclphysa.2018.10.018en_US
dc.subject.keywordsLight-by-light scatteringen_US
dc.subject.keywordsHeavy ionsen_US
dc.subject.keywordsUltraperipheral collisionsen_US
dc.subject.keywordsCMSen_US
dc.subject.keywordsLHCen_US
dc.identifier.scopusSCOPUS:2-s2.0-85060158155
dc.contributor.authorMale1
dc.relation.publicationcategoryArticle - International Refereed Journal - Institution Academic Staff


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