Search for excited charged leptons in electron-positron collisions

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dc.contributor.authorVachon, Brigitte Marie Christine
dc.contributor.supervisorMcPherson, Robert A.
dc.contributor.supervisorSobie, Randall J.
dc.date.accessioned2018-11-13T20:38:25Z
dc.date.available2018-11-13T20:38:25Z
dc.date.copyright2002en_US
dc.date.issued2018-11-13
dc.degree.departmentDepartment of Physics and Astronomy
dc.degree.levelDoctor of Philosophy Ph.D.en_US
dc.description.abstractA search for evidence that fundamental particles are made of smaller subconstituents is performed. The existence of excited states of fundamental particles would be an unambiguous indication of their composite nature. Experimental signatures compatible with the production of excited states of charged leptons in electron-positron collisions are studied. The data analysed were collected by the OPAL detector at the LEP collider. No evidence for the existence of excited states of charged leptons was found. Upper limits on the product of the cross-section and the electromagnetic branching fraction are inferred. Using results from the search for singly produced excited leptons, upper limits on the ratio of the excited lepton coupling constant to the compositeness scale are calculated. From pair production searches, 95% confidence level lower limits on the masses of excited electrons, muons and taus are determined to be 103.2 GeV.en_US
dc.description.scholarlevelGraduateen_US
dc.identifier.urihttp://hdl.handle.net/1828/10294
dc.languageEnglisheng
dc.language.isoenen_US
dc.rightsAvailable to the World Wide Weben_US
dc.subjectLeptons (Nuclear physics)en_US
dc.subjectPositronsen_US
dc.subjectElectron-positron interactionsen_US
dc.titleSearch for excited charged leptons in electron-positron collisionsen_US
dc.typeThesisen_US

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