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

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dc.authorid0000-0002-2614-5860en_US
dc.contributor.authorSirunyan, A. M.
dc.contributor.authorTumasyan, A.
dc.contributor.authorAdam, W.
dc.contributor.authorAmbrogi, F.
dc.contributor.authorAsilar, E.
dc.contributor.authorSağır, Sinan
dc.contributor.authorCERN Collaboration
dc.date.accessioned2021-01-10T06:54:35Z
dc.date.available2021-01-10T06:54:35Z
dc.date.issued2019
dc.departmentKMÜ, Sağlık Hizmetleri Meslek Yüksekokulu, Tıbbi Hizmetler ve Teknikler Bölümüen_US
dc.descriptionWOS:000457515500183en_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.description.sponsorshipScience and Technology Facilities CouncilScience & Technology Facilities Council (STFC) [ST/I505580/1, ST/K003542/1 GRID PP, ST/L005603/1, ST/N001273/1, ST/M004775/1, ST/J004871/1, ST/F007434/1, ST/K003542/1, ST/I003622/1, ST/N000242/1] Funding Source: researchfishen_US
dc.identifier.citationSirunyan, A. M., Tumasyan, A., Adam, W., Ambrogi, F., Asilar, E., ... Sinan, S. (2019). Evidence for light-by-light scattering in ultraperipheral PbPb collisions at root S-NN=5.02 TeV. Nuclear Physics A, 982.
dc.identifier.doi10.1016/j.nuclphysa.2018.10.018
dc.identifier.endpage794en_US
dc.identifier.issn0375-9474
dc.identifier.issn1873-1554
dc.identifier.scopusscopusidyok
dc.identifier.startpage791en_US
dc.identifier.urihttps://doi.org/10.1016/j.nuclphysa.2018.10.018
dc.identifier.urihttps://hdl.handle.net/11492/3866
dc.identifier.volume982en_US
dc.identifier.wosWOS:000457515500183
dc.identifier.wosqualityQ3
dc.indekslendigikaynakWeb of Sceince
dc.indekslendigikaynakScopus
dc.institutionauthorSağır, Sinan
dc.language.isoen
dc.publisherElsevieren_US
dc.relation.journalNuclear 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.typeArticle

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