Evidence For Light-By-Light Scattering And Searches For Axion-Like Particles İn Ultraperipheral Pbpb Collisions At ?Snn=5.02 TeV

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dc.authorid249433en_US
dc.contributor.authorBilki, Burak
dc.contributor.author., ve diğer.
dc.date.accessioned2019-12-29T11:46:03Z
dc.date.available2019-12-29T11:46:03Z
dc.date.issued2019
dc.departmentİstanbul Beykent Üniversitesien_US
dc.description.abstractEvidence for the light-by-light scattering process, ?????, in ultraperipheral PbPb collisions at a centre-of-mass energy per nucleon pair of 5.02TeVis reported. The analysis is conducted using a data sample corresponding to an integrated luminosity of 390?b?1recorded by the CMS experiment at the LHC. Light-by-light scattering processes are selected in events with two photons exclusively produced, each with transverse energy E?T>2GeV, pseudorapidity |??| <2.4, diphoton invariant mass m??>5GeV, diphoton transverse momentum p??T<1GeV, and diphoton acoplanarity below 0.01. After all selection criteria are applied, 14 events are observed, compared to expectations of 9.0 ±0.9(theo)events for the signal and 4.0 ±1.2(stat)for the background processes. The excess observed in data relative to the background-only expectation corresponds to a significance of 3.7 standard deviations, and has properties consistent with those expected for the light-by-light scattering signal. The measured fiducial light-by-light scattering cross section, ?fid(?????) =120 ±46(stat)±28(syst)±12(theo)nb, is consistent with the standard model prediction. The m??distribution is used to set new exclusion limits on the production of pseudoscalar axion-like particles, via the ???a???process, in the mass range ma=5–90GeV.en_US
dc.identifier.citationPhysics Letters B 797(2019)134826en_US
dc.identifier.doi10.1016/j.physletb.2019.134826
dc.identifier.issn0370-2693
dc.identifier.scopus2-s2.0-85070721104
dc.identifier.scopusqualityQ1en_US
dc.identifier.urihttps://doi.org/10.1016/j.physletb.2019.134826
dc.identifier.wosWOS:000488071200025en_US
dc.identifier.wosqualityQ1en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.language.isoenen_US
dc.publisherThe CMS Collaborationen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.subjectLight-by-lighten_US
dc.subjectCMSen_US
dc.subjectUPCen_US
dc.subjectPhotoproductionen_US
dc.subjectPbPben_US
dc.titleEvidence For Light-By-Light Scattering And Searches For Axion-Like Particles İn Ultraperipheral Pbpb Collisions At ?Snn=5.02 TeVen_US
dc.typeArticleen_US

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