U-Spin Symmetry Test of the Sigma*+ Electromagnetic Decay
by Keller, Dustin M., Ph.D., OHIO UNIVERSITY, 2010, 288 pages; 3433975

Abstract:

This dissertation presents analysis for electromagnetic decay of the Σ 0(1385) from the reaction γp → K +Σ*0. Also presented is the first ever measurement of the electromagnetic decay of the Σ+(1385) from the reaction γ p → K0Σ*+. Both results are extracted from the g11α data set taken using the CLAS detector at Thomas Jefferson National Accelerator Facility. A real photon beam with a maximum energy of 3.8 GeV was incident on a liquid hydrogen target during the experiment resulting in the photoproduction of the kaon and Σ* hyperons. Kinematic fitting is used to separate signal from background in each case. For the first time, a method to kinematically fit the neutron in the Electromagnetic Calorimeter (EC) of CLAS was performed, leading to a high statistics study of the neutron resolutions in the EC. New techniques in neutron resolution matching for Monte Carlo simulation using dynamic variable smearing are also developed. The results from the Σ0(1385) electromagnetic decay lead to smaller statistical and systematic uncertainties than the previous measurement by Taylor et al. A U-spin symmetry test using the U-spin SU(3) multiplet representation gave a prediction for the Σ* + → Σ+γ partial width and the Σ* 0 → Λγ partial width. The latter agrees, within the experimental uncertainties, with the prediction from U-spin symmetry, but the former reaction is much smaller than its prediction.

 
AdviserKenneth H. Hicks
SchoolOHIO UNIVERSITY
SourceDAI/B 72-02, p. , Feb 2011
Source TypeDissertation
SubjectsNuclear Physics; Particle physics
Publication Number3433975
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