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PRISM/PRISM-II

PRISM/PRISM-II. Masaharu Aoki, Osaka University June 5-11, 2003 NuFACT'03 Columbia University. The muon is the best place to search for new physics beyond the Standard Model. Muon LFV Forbidden Process Muon EDM Suppressed Process Muon g-2 Precise Measurement. SUSY-GUT Prediction.

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PRISM/PRISM-II

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  1. PRISM/PRISM-II Masaharu Aoki, Osaka University June 5-11, 2003 NuFACT'03 Columbia University

  2. The muon is the best place to search for new physics beyond the Standard Model. • Muon LFV Forbidden Process • Muon EDM Suppressed Process • Muon g-2 Precise Measurement

  3. SUSY-GUT Prediction • SU(5) SUSY-GUT Predictiononly a few orders of magnitude below the current experimental limit. • SO(10) SUSY-GUT Predictionenhanced by (mt/mm)2(~100) from SU(5) prediction. Courtesy Hisano

  4. Muon and n Oscillation n oscillation + SUSY → LFV

  5. Leptogenesis CPV in CKM is not enough to explain Baryon Asymmetry → New sources of CPV beyond the SM • Oscillation + CPV in lepton sector → leptogenesis Fukugida & Yanagida ‘86 AND if SUSY exists → ・muon EDM ・T-violation in muon LFV

  6. ~ ~ ~ ~ m m m m SUSY with the Muon CPV m-LFV m m g-2 m-EDM • m-e conversion • m → e g SUSY particles normal particles squark quark ex. K-decays, B-decays slepton lepton (neutrino) ex. neutrino oscillation ex. charged lepton LFV

  7. New Generation of Muon Experiments • Muon Lepton Flavor Violation • BR(m → e g) < 10-14 • BR(m N → e N) < 10-16 • BR(m N → e N) < 10-18 • m-EDM • dm < 10-19 e.cm→ dm < 10-24 e.cm • g-2 • 0.7 ppm → 0.05 ppm

  8. PRISM for m-LFV • intensity : 1011-1012m±/sec • muon kinetic energy : 20 MeV (=68 MeV/c) • range = about 3 g • kinetic energy spread : ±0.5-1.0 MeV • ±a few 100 mg range width • beam repetition : about 100Hz Phase Rotated Intense Slow Muon source

  9. PRISM Scheme • pulsed proton beam • pion capture by high solenoid field • pion decay section • phase rotation section

  10. PRISM and Neutrino Factory • PRISM • Looks like a Front End of n-Factory • Pion Capture • Phase Rotation • Differences • Higher repetition • Lower instantaneous muon rate • Lower momentum • For stopped-muon experiment

  11. Pion capture section Decay section Phase rotation section FFAG Based a ring instead of linear systems reduction of # of rf cavities reduction of rf power consumption compact PRISM layout Construction has began. not in scale

  12. PRISM-2 for m-EDM • dm<10-24 e.cm → NP2>1016 total • Long decay section with pion momentum selection • Initial muon ~2×1010 • Polarization ~0.6 • Backward decay of pions • Accept 500 MeV/c muons and phase rotate • Transverse 800 p mm.mrad • Momentum acceptance ±30% • →±1~2% for muon strage ring • Decay survivability ~56% • NP2 = 109~1010 毎秒 1st ring of FFAG Neutrino Factory

  13. J-PARC at Tokai, Japan

  14. J-PARC:Site Layout Proposal

  15. J-PARC: Site Layout Proposal (Cont.)

  16. Staging Physics outcomes at each stage • High Power Proton Driver • Muon g-2 • Muon Factory (PRISM) • Muon LFV • Muon Factory-II (PRISM-II) • Muon EDM • Neutrino Factory • Based on 1 MW proton beam • Neutrino Factory-II • Based on 4.4 MW proton beam • Muon Collider

  17. Summary • The muon holds great potential for discovery of the physics beyond the Standard Model. • Technologies developed for the world's Neutrino Factories are also very important for the future of muon physics. • Staging is a key toward the realization of the neutrino factory and muon collider.

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