Collaboration Switzerland PSI Russia BINP Novosibirs k PSI

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Collaboration Switzerland PSI Russia BINP, Novosibirs k ● PSI LXe Tests and Purification Drift

Collaboration Switzerland PSI Russia BINP, Novosibirs k ● PSI LXe Tests and Purification Drift Chamber, Beam Line, DAQ ● BINP ● INFN Italy INFN, Pisa e+ counter, Trigger, M. C. Japan ICEPP, Univ. of Tokyo, Waseda Univ. , IPNS, KEK, Nagoya Univ. , Osaka Univ. LXe Calorimeter, Cryogenics Superconducting Solenoid, M. C. 日本物理学会 第56回年次大会@中央大学多摩キャンパス ● KEK ● ICEPP, Waseda ●Nagoya ● Osaka Univ. 27/Mar/2001 K. Ozone

Physics Motivation History of μ→eγ Recent topics put spurs to μ→eγ search. ● SK

Physics Motivation History of μ→eγ Recent topics put spurs to μ→eγ search. ● SK result confirms LFV for neutral lepton. ● ν mixing is expected enhance the rate of LFV process In SUSY. ● Anomalous Muon 日本物理学会 第56回年次大会@中央大学多摩キャンパス to (g-2) 27/Mar/2001 K. Ozone

Signal and Backgrounds • μbeam stopped on the target; 108/sec – Ee = 52.

Signal and Backgrounds • μbeam stopped on the target; 108/sec – Ee = 52. 8 Me. V, Eγ = 52. 8 Me. V – θγe+ = 180° Back to back, in time m • Main background sources (1) Radiative m+ decay e (2) Accidental overlap mgenng NOT back to back And NOT in time a. Reduced down to 10 -15 level n ● 検出器に要求される分解能 Ee: 0. 3%, Eγ: 0. 6%, θeγ: 5. 1 mrad, teγ: 64 psec e 日本物理学会 第56回年次大会@中央大学多摩キャンパス (1) g mgenn+”g” g n n n ? (2) 27/Mar/2001 K. Ozone

μ+→e+γ探索実験用検出器 γ detection ● LXe Photon Detector e+ detection ● COBRA Spectrometer ・ Drift

μ+→e+γ探索実験用検出器 γ detection ● LXe Photon Detector e+ detection ● COBRA Spectrometer ・ Drift Chamber については Chamber 30 a. SC(9: 45~) 西口の talk で。 ・ Timing Counter ・ COBRA 日本物理学会 第56回年次大会@中央大学多摩キャンパス Magnet 27/Mar/2001 K. Ozone

GEANT 3 によるM. C. simulation • Signal is distributed over many PMTs in most

GEANT 3 によるM. C. simulation • Signal is distributed over many PMTs in most cases • Weighted mean of PMTs on the front face dx ~ 4 mm FWHM • Broadness of distribution dz ~ 16 mm FWHM • Timing resolution dt ~ 100 ps FWHM • Energy resolution ~ 1. 4% FWHM depends on light attenuation in LXe 日本物理学会 第56回年次大会@中央大学多摩キャンパス 27/Mar/2001 K. Ozone

Mini-Kamiokande ↓ Large Prototype ↑ Small Prototype 37. 2 cm 49. 6 cm ←

Mini-Kamiokande ↓ Large Prototype ↑ Small Prototype 37. 2 cm 49. 6 cm ← Super Kamiokande 日本物理学会 第56回年次大会@中央大学多摩キャンパス (こっちの方がもちろんでかい!) 27/Mar/2001 K. Ozone