Photon Beam Asymmetry Measurement from the gamma n -> Kaon+ Sigma- Reaction

Strangeness channels are important in the experimental search for missing baryon resonances. Phenomenological reaction models for the extraction of resonance parameters, such as coupled-channels analyses, require data for many observables, in different channels, and on different targets. The analysis presented in this thesis is the first measurement of the beam asymmetry over a wide range in the kaon azimuthal center-of-mass angle (which is essential for accessing the s-channel contribution) for the exclusive gamma n -> Kaon+ Sigma- reaction, using the deuteron as a quasi-free neutron target. The data used were from the CLAS g13b run period (experiment E06-103) at Jefferson Lab, which used linearly polarized tagged real photons with energies between 1.1 and 2.3 GeV. Results are shown for two photon-energy bins: 1.9-2.1 and 2.1-2.3 GeV. They agree well (within uncertainties) with the beam asymmetries obtained at LEPS for forward angles, but show a clear disagreement with the predictions from the current Kaon-MAID over wide range of kaon c.m. angles.

Author

• Munevar Espitia, Edwin

Language

• en

Keyword

• Photon beam asymmetry
• polarization observables
• missing resonances
• kaon photoproduction

Date created

• 2014

Type of Work

• Dissertation

License

• All rights reserved

Rights statement

• In Copyright

GW Unit

• Physics

Degree

• Ph.D.

Advisor

• Feldman, Gerald
• Nadel-Turonski, Pawel

Committee Member(s)

• Park, William
• Alexandru, Andrei
• Strauch, Steffen
• Opper, Allena

Persistent URL

•  https://scholarspace.library.gwu.edu/etd/5q47rn869