COMET Experiment searching for muon to electron conversion

The COMET is one of experiments that search for new physics beyond the Standard Model. It is dedicated to searching for charged lepton flavor violation processes with muon to electron in a muonic atom ( µ−N → e−N ). A staging approach is planed for the COMET experiment. The COMET Phase-I plans to achieve a signal sensitivity of 3 × 10−15 in 2017 followed by the COMET Phase-II with the sensitivity of 10−17 in 2020.[1] In this paper, I introduce status of the COMET Phase-I, which consists of a proton beam line, a muon beam section and a detector section. A pion capture system will be installed at the end of the proton beam line to provide a very intense muon beam of 1 × 109 µ/sec. The pion capture system is currently under construction at J-PARC. The detector section has a muon stopping target surrounded by a Cylindrical Drift Chamber (CDC).