Simulation of Light Propagation Through CsI for the Mu2e Experiment

The Mu2e experiment will search for charged lepton flavor violating neutrino-less conversion from a negative muon into an electron in the field of a nucleus. This reaction is extremely suppressed in the Standard Model of particle physics and an observation would be a clear sign of new physics. Mu2e plans to improve the current sensitivity on mu-to-e conversion by four orders of magnitude. The experiment relies on a crystal calorimeter to separate electrons from muons to reduce background. Using the Geant4 framework, we model the transit time taken by optical photons to reach the photomultiplier as a function of their origin for different crystal geometries. By cataloging these distributions, my project will improve the accuracy of the simulated time-of-flight data used to create the particle identification algorithms used in the experiment.