Abstract:

The COMET experiment is aimed to search for the charged lepton flavor violation through the observation of Nμ- →Ne- with an expected sensitivity to 2.9×10-17 in the single-event (neutrino-free) decay. The exclusion of the cosmic muon signature from the analysis at the level of 0.1 events per year is one of the necessary conditions for ensuring such accuracy. This, in turn, requires an overall Cosmic Ray Veto system efficiency of no worse than 99.99% in detecting cosmic muons.

JINR scientists have completed a full cycle of development and design of this system for the COMET experiment. The optimal module geometry to ensure the required efficiency at the level of 99.99% is found, the design of the appropriate front-end electronics is on the way, the technology to launch mass production of modules and the quality control at each production stage are developed.