The Mu2e fast track-trigger performance

The Mu2e experiment plans to search for neutrino-less muon to electron conversion in the field of a nucleus. Such a process violates lepton flavor conservation. To perform this search, a muon beam is focused on an aluminum target, the muons are stopped in the field of the aluminum nucleus, and electrons emitted from subsequent muon decays in orbit are measured. The endpoint energy for this process is 104.97 MeV; an excess of measured electrons at this energy signifies neutrino-less muon to electron conversion has occurred. Currently under construction at the Fermilab Muon Campus, Mu2e will stop muons on target in 3 years of running, with the goal of reaching a single event sensitivity of on the branching ratio. To reach such a sensitivity, a tracker with momentum resolution of around 180 keV/c is needed. Further, the trigger system must reconstruct conversion electron tracks with > 90% efficiency and, due to data constraints, have a trigger rate of < a few kHz and process events in < 5 ms. Processing events this quickly and efficiently represents a significant experimental challenge. The work reported on here details important aspects of the trigger, and current studies on potential ways to improve processing speeds.