Searching for the Muon Decay to Three Electrons with the Mu3e Experiment

• DOI: 10.3390/universe7110420
• Publication Date: 2021-11-04T01:57:49Z
• Authors: Cristina Martin P...; Luigi Vigani
• Keywords: Tracking (education); Time projection chamber; Momentum (technical analysis)

Mu3e is a dedicated experiment designed to find or exclude the charged lepton flavor violating μ→ eee decay at branching fractions above 10−16. The search pursued in two operational phases: Phase I uses an existing beamline Paul Scherrer Institute (PSI), targeting single event sensitivity of 2·10−15, while ultimate reached II using high intensity muon under study PSI. As heavily suppressed Standard Model particle physics, observation such signal would be unambiguous indication existence new physics. Achieving desired requires rate muons (108 stopped per second) along with detector large kinematic acceptance and efficiency, able reconstruct low momentum electrons positrons. To achieve this goal, mounted ultra thin tracking based on monolithic active pixel sensors for excellent vertex resolution, combined scintillating fibers tiles precise timing measurements.