Characterization of drift effects in the Mu2e Tracker detector

The Mu2e experiment at Fermilab is designed to search for charged-lepton flavor violation (CLFV) processes through a neutrinoless, coherent muon-to-electron conversion in the atomic field of aluminum. The current experimental sensitivity, determined by the SINDRUM II experiment, is of the order of 10^-13. Mu2e aims to improve this sensitivity by a factor of four orders of magnitude. The observation of muon-to-electron conversion would constitute unambiguous evidence of physics beyond the Standard Model.

To achieve its physics goals, Mu2e employs a low-mass tracking detector composed of thin straw tubes with central tungsten wires filled with a low-density gas. Charged particles traversing the detector will ionize the gas, and the resulting electrons will drift towards the tungsten wires. A precise characterization of these drift effects is essential for the accurate reconstruction of signal candidate events in the detector. This presentation will provide a report on the ongoing efforts to characterize the drift effects in the Mu2e Tracker, in preparation for the commissioning run with cosmic rays data planned to begin in the first half of 2026.