Date of Award
Master of Science
Physics and Astronomy
This thesis presents a compilation of the latest research on J/Ψ polarization and bremsstrahlung along with the background surrounding the J/Ψ’s history. It covers the fundamentals of the standard model, quantum chromodynamics, deep inelastic scattering, and the calculations behind charm-anticharm production from hadron collisions. It shows research that’s centered on recombining identified bremsstrahlung with di-electron pairs to improve the J/Ψ invariant mass peak. The research for polarization studies simulated J/Ψ di-electron pairs with no polarization and pT between 0.0 to 1.5 GeV in the central arm. The PHENIX detector systems, namely the drift chamber, electromagnetic calorimeter, and RICH, are used to identify electrons. To examine the quality of the polarization fit, χ2 methods are used to scrutinize the simulated data.
The bremsstrahlung research shows that there is a clear indication that bremsstrahlung can be identified at an opening angle less than 0.07 radians from their parent electron, and they are mostly found on the western half of the detector. In the polarization study, simulations show that measuring the polarization in the central arm would be feasible if one were to examine the real data using the same methods.
Nels Jacob Hotvedt
Hotvedt, Nels Jacob, "Spin polarization of J/Ψ through lepton decay" (2017). Graduate Theses and Dissertations. 16146.