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Description
The nucleon resonance spectrum consists of many overlapping excitations. Polarization observables are an important tool for understanding and clarifying these spectra. While there is a large data base of differential cross sections for the process, very few data exist for polarization observables. A program of double polarization experiments has been

The nucleon resonance spectrum consists of many overlapping excitations. Polarization observables are an important tool for understanding and clarifying these spectra. While there is a large data base of differential cross sections for the process, very few data exist for polarization observables. A program of double polarization experiments has been conducted at Jefferson Lab using a tagged polarized photon beam and a frozen spin polarized target (FROST). The results presented here were taken during the first running period of FROST using the CLAS detector at Jefferson Lab with photon energies ranging from 329 MeV to 2.35 GeV. Data are presented for the E polarization observable for eta meson photoproduction on the proton from threshold (W=1500 MeV) to W=1900 MeV. Comparisons to the partial wave analyses of SAID and Bonn-Gatchina along with the isobar analysis of eta-MAID are made. These results will help distinguish between current theoretical predictions and refine future theories.
ContributorsMorrison, Brian (Author) / Ritchie, Barry (Thesis advisor) / Dugger, Michael (Committee member) / Shovkovy, Igor (Committee member) / Davies, Paul (Committee member) / Alarcon, Ricardo (Committee member) / Arizona State University (Publisher)
Created2011
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Description
A series of experiments using a polarized beam incident on a polarized frozen spin target

(FROST) was conducted at Jefferson Lab in 2010. Results presented here were taken

during the second running period with the FROST target using the CEBAF Large Acceptance

Spectrometer (CLAS) detector at Jefferson Lab, which used transversely-polarized

protons in a

A series of experiments using a polarized beam incident on a polarized frozen spin target

(FROST) was conducted at Jefferson Lab in 2010. Results presented here were taken

during the second running period with the FROST target using the CEBAF Large Acceptance

Spectrometer (CLAS) detector at Jefferson Lab, which used transversely-polarized

protons in a butanol target and a circularly-polarized incident tagged photon beam with

energies between 0.62 and 2.93 GeV. Data are presented for the F and T polarization observables

for h meson photoproduction on the proton from W = 1.55 GeV to 1.80 GeV.

The data presented here will improve the world database and refine theoretical approaches

of nucleon structure.
ContributorsTucker, Ross (Author) / Ritchie, Barry (Thesis advisor) / Dugger, Michael (Committee member) / Alarcon, Ricardo (Committee member) / Lebed, Richard (Committee member) / Arizona State University (Publisher)
Created2016