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OF THE DISSERTATION FIRST TIME MEASUREMENTS OF POLARIZATION OBSERVABLES FOR THE CHARGED CASCADE HYPERON IN PHOTOPRODUCTION by Jason Bono Florida International University, 2014 Miami, Florida Professor Lei Guo, Major Professor The parity violating weak decay of hyperons offers a valuable means of measuring their polarization, providing insight into the production of strange quarks and the matter they compose. Jefferson Lab’s CLAS collaboration has utilized this property of hyperons, publishing the most precise polarization measurements for the Λ and Σ in both photoproduction and electroproduction to date. In contrast, cascades, which contain two strange quarks, can only be produced through indirect processes and as a result, exhibit low cross sections thus remaining experimentally elusive. At present, there are two aspects in cascade physics where progress has been minimal: characterizing their production mechanism, which lacks theoretical and experimental developments, and observation of the numerous excited cascade resonances that are required to exist by flavor SU(3)F symmetry. However, CLAS data were collected in 2008 with a luminosity of 68 pb−1 using a circularly polarized photon beam with energies up to 5.45 GeV, incident on a liquid hydrogen target. This dataset is, at present, the world’s largest for meson photoproduction in its energy range and provides a unique opportunity to study cascade physics with polarization measurements. The current analysis explores hyperon production through the γp→ K+K+Ξ− reaction by providing the first ever determination of spin observables P , Cx and Cz for the cascade. Three of our primary goals are to test the only cascade photoproduc-

First Time Measurements of Polarization Observables for the Charged Cascade Hyperon in Photoproduction