Participating Countries and International Organizations:
Belarus, Czech Republic, Georgia, Germany, United Kingdom, France, Russia, Japan. 
Scientific Programme:
Te goal of the COMET experiment at the accelerator of J-PARC is the search for a neutrinoless conversion of a muon into an electron µ ^- N e ^- N, in which the lepton number in the charged sector does not conserve. Within the SM, modified taking into account the neutrino oscillations, the expected rate is less than 10 ^-50 and so any observation of conversion would be a clear signal of a new physics beyond the SM. A measurement at the level 10 ^-17 for conversion, which is the COMET goal, is a factor of 10000 better than that of the current experimental limit B(µ ^-+ Auµ e ^- + Au) < 7·10 ^-13 from SINDRUM-II at PSI. 

Expected main results in 2018:

• R&D on thin-wall straw-tubes for experiment COMET. Development, production and tests of the straw detector and electromagnetic calorimeter prototypes with a beam. 
  
  
• Calibration of LYSO crystals.