Energy calibration in the CCM detector using Michel electrons from stopping cosmic ray muons.

The Coherent CAPTAIN-Mills experiment (CCM) at Los Alamos National Laboratory (LANL) has collected data in its 3-year run cycle in search of sterile neutrinos and light dark matter. An 800 MeV pulsed proton beam is incident on a tungsten target producing neutrons, pions, neutrinos, and potentially dark matter. CCM is a 10-ton liquid argon scintillation detector located 23 meters from the target to study neutrinos and Beyond the Standard Model physics (BSM). A key feature to identifying new particles is the energy calibration. Sodium-22 has been used to measure energy resolution at the low end of the energy scale (~1 MeV). Another calibration point can be achieved by using the measured Michel electron energy spectrum from cosmic muon decays—providing another anchor point around 52 MeV. In this talk, I will present the latest progress in identifying Michel electrons and using their energy spectrum to determine a PE-to-MeV calibration at this high energy regime in the CCM detector.