COMET stands for Coherent Muon to Electron Transition and the experiment seeks to measure the neutrinoless, coherent transition of a muon to an electron in the field of an aluminum nucleus. COMET is an international collaboration and it takes place at the Japan Proton Accelerator Research Complex (J-PARC) in Tokai, Japan, carried out in Nuclear and Particle Physics Experimental Hall. The COMET experiment uses hadron beams to study charged Lepton flavour violations, specifically in the search for coherent conversion of muons to electrons without neutrinos.

The experiment will be conducted in two phases. Phase I will employ a simplified detector and will be used to investigate the beam and backgrounds whilst aiming at a sensitivity two orders of magnitude better than the current limit. Phase II will use the information gained in Phase I, a much more intense beam, and a more complex detection system to achieve a further two orders of magnitude of sensitivity.