Evidence for light-by-light scattering in ultraperipheral PbPb collisions at root S-NN=5.02 TeV

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dc.WoS.categoriesPhysics, Nuclearen_US
dc.authorid0000-0002-9007-8260en_US
dc.contributor.authorYetkin, Elif Aslı
dc.date.accessioned2021-02-10T06:40:54Z
dc.date.available2021-02-10T06:40:54Z
dc.date.issued2019-02
dc.departmentFakülteler, Mühendislik ve Doğa Bilimleri Fakültesi, Enerji Sistemleri Mühendisliği Bölümüen_US
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.fullTextLevelFull Texten_US
dc.identifier.doi10.1016/j.nuclphysa.2018.10.018en_US
dc.identifier.issn1873-1554
dc.identifier.issn0375-9474
dc.identifier.urihttps://hdl.handle.net/11411/3228
dc.identifier.urihttps://doi.org/10.1016/j.nuclphysa.2018.10.018
dc.identifier.wosWOS:000457515500183en_US
dc.identifier.wosqualityQ3en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.language.isoenen_US
dc.nationalInternationalen_US
dc.numberofauthors200+en_US
dc.pages791-794en_US
dc.publisherELSEVIERen_US
dc.relation.ispartofNUCLEAR PHYSICS Aen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectLight-by-light scatteringen_US
dc.subjectHeavy ionsen_US
dc.subjectUltraperipheral collisionsen_US
dc.subjectCMSen_US
dc.subjectLHCen_US
dc.titleEvidence for light-by-light scattering in ultraperipheral PbPb collisions at root S-NN=5.02 TeVen_US
dc.typeArticleen_US
dc.volume982en_US

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