# Presentation: 801198

## 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

## Neutrino mixing has been established.

Contribution to LFV process

B(e) =small !

- Contribution to LFV process
- B(e) =small !

-  Oscillation & Muon LFV

- Very small

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

## Muon LFV & beyond the SM

- W. Molzon, NP02

## SU(5) SUSY-GUT Predictiononly a few orders of magnitude below the current experimental limit.

SO(10) SUSY-GUT Predictionenhanced by (m/m)2(~100) from SU(5) prediction.

- SO(10) SUSY-GUT Predictionenhanced by (m/m)2(~100) from SU(5) prediction.

- SUSY-GUT Prediction

| Process | CurrentLimit | SUSY-GUTlevel |
| --- | --- | --- |
|  N → e N | 10-13 | 10-16 |
|  → e  | 10-11 | 10-14 |
|  →  | 10-6 | 10-9 |

**Courtesy Hisano**

## Muon and Oscillation

-  oscillation + SUSY → LFV

## 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

## SUSY with the Muon

- -LFV

- -EDM

- g-2

- -e conversion
-  → e 

- quark

- lepton (neutrino)

- slepton

- squark

- normal particles

- SUSY particles

- ex. K-decays, B-decays

- ex. neutrino oscillation

- ex. charged lepton LFV

- CPV

**

**

## New Generation of Muon Experiments

- Muon Lepton Flavor Violation
- BR( → e ) < 10-14
- BR( N → e N) < 10-16
*BR(**** N → e N) < 10**-18*
- -EDM
- d < 10-19 e.cm →* d**** < 10**-24** e.cm*
- g-2
- 0.7 ppm → *0.05 ppm*

## PRISM for -LFV

- intensity : 1011-1012****±/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

**Notes:**
First I'd like to brief you on characteristics of PRISM beam and its scheme.
The aimed intensity is 10^12 mu+-/sec.
PRISM is dedicated for stopped muon experiment, so muon energy is set to 20 MeV.
And its energy spread +-0.5 to 1.0MeV.
Such a  narrow energy spread is achieved by phase rotation technique.

And the beam repetition is about 100Hz.

## PRISM Scheme

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

## PRISM
Looks like a Front End of Factory
Pion Capture
Phase Rotation
Differences
Higher repetition
Lower instantaneous muon rate
Lower momentum
For stopped-muon experiment

- PRISM
- Looks like a Front End of Factory
- Pion Capture
- Phase Rotation
- Differences
- Higher repetition
- Lower instantaneous muon rate
- Lower momentum
- For stopped-muon experiment

- PRISM and Neutrino Factory

## 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

- not in scale

- Construction has began.

**Notes:**
To achieve phase rotation, an unique
circular accelerator of a FFAG is considered to be used. 

This is a schematic layout of FFAG based PRISM.
Off cource we can use LINAC system as phase rotator, but FFAG scheme has many advantage.

The present design of the FFAG ring has a diameter about 10m.

## PRISM-2 for -EDM

- d<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  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

## J-PARC at Tokai, Japan

## J-PARC:Site Layout Proposal

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

## Staging

- 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

- Physics outcomes
- at each stage

## 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.