Electron Energy Loss Analysis in the Mu2e Experiment

The Mu2e experiment at Fermilab aims to search for charged lepton flavor violation by detecting the neutrinoless conversion of muons into electrons in the presence of an aluminum Stopping Target. A key factor in distinguishing signal from the background is understanding the energy loss of electrons produced from muon decay, as they pass through material traveling from the Stopping Target to the Tracker. Recent studies focus on the energy loss patterns in electron trajectories, comparing those with initial upstream z-momentum, to downstream ones. These initial upstream tracks, which are reflected toward the Tracker by the gradient magnetic field, experience higher average energy loss compared to downstream tracks. To better separate these tracks, the potential for measuring the initial electron production time was explored, testing the feasibility of a detector around the Stopping Target. Such a detector could be an upgrade path for future Mu2e data runs. Simulations were also conducted to predict energy loss using various reconstructed track properties. These insights can improve the momentum resolution of conversion electrons, enhancing the experiment's sensitivity to signal events.