Abstract
COMET is an experiment at J-PARC, Japan, which will search for neutrinoless conversion of muons into electrons in the field of a nucleus (μ− + N → e− + N); a lepton flavor violating process. The experimental sensitivity goal for this process is order of 10^−15 for Phase-I and 10^-17 for Phase-II experiment, which is a factor of 100 to 10,000 improvements correspondingly over existing limits. Recent progresses in facility and detector development are presented, along with COMET Phase-I and Phase-II experimental schedule.
Highlights
The discovery of the Higgs boson at the LHC in 2012 provided a successful demonstration of the Standard Model (SM) of particle physics
Three processes are possible for the stopped muon: (1) muon can decay in the orbit (Decay-In-Orbit: DIO) without interacting with nucleus; (2) muon can interact with a proton of the nucleus through charged current, resulting into an excitation of the muonic atom; and (3) muon can decay through charged lepton flavor violation (cLFV) process, which is the target process of μ − e conversion experiment
The COMET experiment is built in the NP Hall, along with a new beam line called B-line, which is under construction
Summary
The discovery of the Higgs boson at the LHC in 2012 provided a successful demonstration of the Standard Model (SM) of particle physics. The SM extension with massive neutrino which enables neutrino oscillation and other theories beyond Standard Model (BSM) enlightens the charged lepton flavor violation (cLFV). In the second stage (Phase-II), full length C-shape transport solenoid, spectrometer solenoid, and straw tube detectors will be used to achieve O(10−17) level of μ − e conversion measurement. These target sensitivities are 100 or 10,000 times better than the current experimental world limit given by SINDRUM-II experiment [2].
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