Date Thesis Awarded
Honors Thesis -- Open Access
Bachelors of Science (BS)
The structure of protons is a point of interest in nuclear physics due to the lack of consensus between the cumulative spin of a proton and the sum of the spins of its constituent quarks. In the GlueX Experiment at the Jefferson Lab Continuous Electron Beam Accelerator Facility (CEBAF), a particle physics process known as Timelike Compton Scattering (TCS), given by the reaction 𝛾𝑝 → 𝑝𝑒+𝑒-, can be used to help potentially explain this discrepancy. With an eventual goal of providing a comparison of the experimental GlueX TCS data to Generalized Parton Distribution (GPD) models, initial research focused on isolating a pure TCS signal from a larger data set containing primarily the background reaction 𝛾𝑝 → 𝑝𝜋+𝜋-. After identifying and placing range restrictions upon experimental variables which are sensitive to the differences between 𝑒± and 𝜋± data, next steps included identifying the scattering plane angles of the electrons and positrons; significant variables in the cross section ratio present in GPDs. Our resulting plot of the 𝜙 plane vs detected 𝑒+𝑒- events indicated that the application of the restrictions that I selected and implemented to a larger data set will make it possible to more conclusively determine the presence and receptivity of TCS to GPD parameters.
Cramer, Alexandra, "Timelike Compton Scattering in the GlueX Experiment at Jefferson Lab" (2018). Undergraduate Honors Theses. William & Mary. Paper 1235.