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

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dc.contributor.author Beaulieu, Alexandre
dc.date.accessioned 2013-08-29T22:39:05Z
dc.date.available 2013-08-29T22:39:05Z
dc.date.copyright 2013 en_US
dc.date.issued 2013-08-29
dc.identifier.uri http://hdl.handle.net/1828/4868
dc.description.abstract This 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.language English eng
dc.language.iso en en_US
dc.subject Experimental particle physics en_US
dc.subject Tau lepton en_US
dc.subject Pion-photon transition form factor en_US
dc.subject New interactions en_US
dc.subject BaBar experiment en_US
dc.title Search for new spin-0 particles near π⁰ mass produced in association with τ pairs at BABAR en_US
dc.type Thesis en_US
dc.contributor.supervisor Roney, J. Michael
dc.degree.department Dept. of Physics and Astronomy en_US
dc.degree.level Master of Science M.Sc. en_US
dc.rights.temp Available to the World Wide Web en_US
dc.description.scholarlevel Graduate en_US
dc.description.proquestcode 0798 en_US

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