Bhabha scattering in e⁺e⁻ collisions at TRISTAN

dc.contributor.authorLai, Anzhien
dc.contributor.committeechairAbashian, Alexanderen
dc.contributor.committeememberGotow, Kazuoen
dc.contributor.committeememberPiilonen, Leo E.en
dc.contributor.committeememberChang, Lay Namen
dc.contributor.committeememberBowden, Robert L.en
dc.contributor.departmentPhysicsen
dc.date.accessioned2014-03-14T21:19:53Zen
dc.date.adate2006-10-04en
dc.date.available2014-03-14T21:19:53Zen
dc.date.issued1992-05-05en
dc.date.rdate2006-10-04en
dc.date.sdate2006-10-04en
dc.description.abstractBhabha scattering, the process of e⁺e⁻ → e⁺e⁻, has been studied at center-of-mass energies from 50 to 58 GeV with the AMY detector at the KEK e⁺e⁻ storage ring TRISTAN. The study is based on a data sample of 79.7 <i>pb⁻¹</i> integrated luminosity. The differential cross section of Bhabha scattering has been measured. The measured cross section is found to agree fairly well with the Standard Model of the electroweak theory. The measured cross section is also compared with various four-fermion contact interaction models, and confidence level lower limits on the composite scale, A, are determined. In addition, the limits on VV model are converted to SM-break-down scales, which indicate the validity of the SM down to the distance of order ~ 10⁻¹⁷ cm and the electron charge radius of ~ 10⁻¹⁶ cm. Attempts are made in searching for an additional boson Z'. No clear signal of the existence of a Z' boson is found up to energy of ~160 GeV/c². The effect of transverse beam polarization on Bhabha scattering is also studied. The ϕ dependence of Bhabha events are fitted to the QED prediction and found to agree with the theory. However, no quantitative conclusion on polarization effect can be drawn based on current data sample, which does not provide enough statistics. More data is being accumulated and further study should be carried out.en
dc.description.degreePh. D.en
dc.format.extentxii, 119 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-10042006-143839en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-10042006-143839/en
dc.identifier.urihttp://hdl.handle.net/10919/39590en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V856_1992.L35.pdfen
dc.relation.isformatofOCLC# 26248004en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V856 1992.L35en
dc.subject.lcshInteracting boson-fermion modelsen
dc.subject.lcshPolarization (Nuclear physics)en
dc.subject.lcshThermal neutrons -- Scatteringen
dc.titleBhabha scattering in e⁺e⁻ collisions at TRISTANen
dc.typeDissertationen
dc.type.dcmitypeTexten
thesis.degree.disciplinePhysicsen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en

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