1. COMET μ-e conversion search at J-PARC

2. μ-e conversion physics SUSY-GUT, SUSY-seesaw (Gauge Mediated process) – BR = 10 -14 = BR(μ→eγ) × O(α) – τ→lγ SUSY-seesaw (Higgs Mediated process) – BR = 10 -12 ~10 -15 – τ→lη Doubly Charged Higgs Boson (LRS etc.) – Logarithmic enhancement in a loop diagram for μ - N → e - N, not for μ→e γ M. Raidal and A. Santamaria, PLB 421 (1998) 250 and many others

3. COMET Experiment Search for LFV process, μ-e conversion with a sensitivity of 10 -16 beyond the world’s best limit of 7x10 -13 obtained by SINDRUM II at PSI J-PARC high- intensity proton beam – 8GeV, 7μA Innovative apparatus – Pion collection – Muon Transport – Electron Spectrometer

4. COMET Beam Line High-p and COMET beamline construction – Share the upstream Branch from A-line using a Lambertson magnet – COMET branch from high-p line No simultaneous usage of two beam lines  Dipole magnet COMET needs 8GeV proton beam, 3.4kW in Phase I and 56kW in Phase II

5. COMET Staging plan Phase I – Construct Capture solenoid and transport line down to the 1 st 90 degree bend Detector system (with a detector solenoid) is connected at the end – 10 -14 sensitivity with 3.4kW proton beam, 3 weeks DAQ – Funding approval in JFY 2012 supplementary budget Phase II – 10 -16 sensitivity with 56kW proton beam (2 years DAQ) 201220132014201520162017 Supercond ucting solenoid Experimen t area Beamline Detector Phase I schedule after JFY2012 budget approval Phase II preparation will be started in parallel to Phase I DAQ. cf. mu2e is planning to start DAQ in late 2010’s

6. COMET Experiment Hall Building construction in 2013-2014 High-p beam line installation in 2014 followed by COMET beam line installation Detector installation is started when the building construction completes

7. COMET Phase-I Detector Transverse tracker + calorimeter – Same technology used in Phase II detector – Beam background study – Physics run smaller acceptance than the CDC design CDC + triggering counter – Physics run Detector R&D and simulation work in progress

8. Expected UK contribution Software development Frontend electronics Trigger and computing Silicon detector for beam monitoring – experience gained in high-luminosity experiment (LHCb) High-power target (RAL)

9. SC test coil （ collaboration with FNAL ） → ↑Neutron irradiation test on the SC wire ←Calorimeter prototype （ GSO). LYSO development in progress in parallel ←Straw tube tracker Prototype → COMET employs the same technology used in NA62 for straw tracker construction