PRISM/PRISM-II

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PRISM/PRISM-II

• Masaharu Aoki, Osaka University
• June 5-11, 2003
• NuFACT'03
• Columbia University

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• 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

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n Oscillation Muon LFV
Muon LFV process is Sensitive to New
Physics Beyond the neutrino Mixing.

• Neutrino mixing has been established.
• Contribution to LFV process
• B(m?eg) small !

Very small
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Muon LFV beyond the SM
W. Molzon, NP02
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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.

Process CurrentLimit SUSY-GUTlevel
m N ? e N 10-13 10-16
m ? e g 10-11 10-14
t ? m g 10-6 10-9
Courtesy Hisano
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Muon and n Oscillation
n oscillation SUSY ? LFV
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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

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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
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New Generation of Muon Experiments

• Muon Lepton Flavor Violation
• BR(m ? e g) lt 10-14
• BR(m N ? e N) lt 10-16
• BR(m N ? e N) lt 10-18
• m-EDM
• dm lt 10-19 e.cm ? dm lt 10-24 e.cm
• g-2
• 0.7 ppm ? 0.05 ppm

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PRISM for m-LFV
Phase Rotated Intense Slow Muon source

• 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

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PRISM Scheme

• pulsed proton beam
• pion capture by high solenoid field
• pion decay section
• phase rotation section

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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

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PRISM layout

• 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

Construction has began.
not in scale
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PRISM-2 for m-EDM

• dmlt10-24 e.cm ? NP2gt1016 total
• Long decay section with pion momentum selection
• Initial muon 21010
• Polarization 0.6
• Backward decay of pions
• Accept 500 MeV/c muons and phase rotate
• Transverse 800 p mm.mrad
• Momentum acceptance 30
• ?12 for muon strage ring
• Decay survivability 56
• NP2 1091010 ??

1st ring of FFAG Neutrino Factory
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J-PARC at Tokai, Japan
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J-PARCSite Layout Proposal

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J-PARC Site Layout Proposal (Cont.)

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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

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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.