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OF THE DISSERTATION POLARIZATION OBSERVABLES FOR γp→ KΛ AT PHOTON ENERGIES UP TO 5.45 GeV by Shankar D. Adhikari Florida International University, 2018 Miami, Florida Professor Lei Guo, Co-Major Professor Professor Brian A. Raue, Co-Major Professor Study of the excited-state nucleon have been long established as an important tool to understand quantum chromodynamics in the non-perturbative region. Even after decades of study, not all of the excited states predicted by different theoretical approaches have been verified. The disparity between the predicted states and the verified states is known as the “missing baryon problem.” The verified states were mostly established using pion beam data or through πN decay channels, but are not sufficient to address the missing baryon problem. In recent years, new experiments were conducted worldwide at CLAS in Jefferson Lab, ELSA in Bonn, MAMI in Mainz, and so on, using electromagnetic probes that also included the study of multiple channels with different final states. Since excited baryon states are broad and overlap, they are difficult to disentangle using cross-section data alone. Thus, polarization observables can play a crucial role in the identification of missing baryons. The current work uses CLAS g12 data, which were obtained from a circularly polarized photon beam incident upon an unpolarized hydrogen target, γp → KΛ, from CLAS at Jefferson Lab. Because of the weak decay of the Λ hyperon, it is possible to measure the polarization observables from decay products, particularly pπ− with a 64% branching ratio. We measured the transferred polarization observables Cx and Cz, and the induced polarization P . The measurement covers the center-of-

Polarization Observables for γp −> K+Λ at Photon Energies up to 5.45 GeV