Search for new spin-0 particles near π⁰ mass produced in association with τ pairs at BABAR

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dc.contributor.authorBeaulieu, Alexandre
dc.contributor.supervisorRoney, J. Michael
dc.date.accessioned2013-08-29T22:39:05Z
dc.date.available2013-08-29T22:39:05Z
dc.date.copyright2013en_US
dc.date.issued2013-08-29
dc.degree.departmentDepartment of Physics and Astronomy
dc.degree.levelMaster of Science M.Sc.en_US
dc.description.abstractThis research project searches for new physics in the τ sector that would resolve the tension between BABAR measurement for the pion-photon transition form factor Fπ0(Q^2)and the standard model asymptotic prediction. This behaviour could be explained by a new light pseudo-scalar state that mixes with the π 0 and enhances its coupling to the c and b quarks or the τ lepton, or by a new spin-0 particle with mass very close to the π 0 . We examine one channel to test for existence of such objects: their creation in association with τ pairs in e+ e− collisions. The analysis uses a typical cut-based approach as the large predicted cross-sections and the kinematics of the final states allow for a direct selection of signal events and background suppression. Current simulation studies predict a 90% CL limit on the production cross-section on the order of 100 fb in case of no signal, while the theory predicts production cross-sections on the order of 1 pb to 100 pb depending on the model.en_US
dc.description.proquestcode0798en_US
dc.description.proquestemailbeaa@uvic.caen_US
dc.description.scholarlevelGraduateen_US
dc.identifier.urihttp://hdl.handle.net/1828/4868
dc.languageEnglisheng
dc.language.isoenen_US
dc.rights.tempAvailable to the World Wide Weben_US
dc.subjectExperimental particle physicsen_US
dc.subjectTau leptonen_US
dc.subjectPion-photon transition form factoren_US
dc.subjectNew interactionsen_US
dc.subjectBaBar experimenten_US
dc.titleSearch for new spin-0 particles near π⁰ mass produced in association with τ pairs at BABARen_US
dc.typeThesisen_US

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