University of Connecticut

Events Calendar

PhD Defense

Thursday, April 19, 2018
1:30pm – 3:30pm

Storrs Campus

Fridah Mokaya, Department of Physics, University of Connecticut

High Statistics Analysis of All-Neutral Decays of Vector Mesons with the Radphi Experiment

The differential cross section and spin density matrix elements for ω(782) meson photoproduction in the reaction 9Be(γp, pω)8Li have been measured in the energy range 4.4 - 5.4 GeV using the Radphi detector. Radphi used a 9Be target, and identified the final state by triggering on the recoil proton plus neutrals. At the kinematics of this experiment, the observed nuclear cross section is consistent with the γp cross section measured by prior experiments when multiplied by 4 for the number of protons in the nucleus, in agreement with a naive spectator model. However, the spin observables show some deviation from a spectator model, particularly approaching the low-t limit of the experimental acceptance. Besides the cross sections, spin density matrix elements in Gottfried Jackson and Helicity frame have been measured. The data selection is discussed and the acceptance is examined and quantified. The results are compared to a model for vector photoproduction.


Prof. R. Jones

Physics Department (primary)

Control Panel