1. PRISM-II and Measurement of Muon Electric Dipole Moment based on J-PARC mu-edm LoI NuFACT-J'03 M. Aoki Osaka University

2. Contents ◆ Muon electric dipole moment ◆ Concept of the mu-edm measurement ◆ PRISM-II ◆ Muon storage ring ◆ Experimental Site ◆ Control of the systematics ◆ Summary

3. 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

4. g-2 and mu-edm ◆ General dipole moment, D

6. 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 oscillationex. charged lepton LFV CPV   ~  ~ 

7. g-2 and muon-EDM in SUSY ◆ a  (SM(DEHZ))-a  (Exp) = (33.9±10.6)x10 -10 ◆ d  < 10 -20 e.cm

8. Concept of the experiment ◆ Muon spin precession （相対）  第１項外部磁場による mdm の回転  第２項外部電場がローレンツ変換されてつくる磁 場による mdm の回転  第３項 edm の回転 ◆第１項を第２項でキャンセルする ◆ β×B による電場をつかう

9. ◆キャンセル電場  E=aBcβγ 2 E=2 MeV/m 、 B=0.25 T ◆ Edm 電場  E=BcβB=0.25 T → E=72 MeV/m

11. PRISM for mu-edm ◆ Accelerate low energy muon upto 500 MeV/c  Initial muon~10 11  Decay survivability~6%  Polarization~0.2?  NP 2 = 10 8 毎秒 ◆一方、  d  10 16 total PRISM 20 - 500 MeV

12. PRISM-2 for mu-edm ◆ Accept 500 MeV/c muons and phase rotate  Initial muon~2×10 10  Decay survivability~56%  Polarization~0.6  NP 2 = 10 9 ~10 10 毎秒  Transverse 800  mm.mrad  Momentum acceptance ±30% PRISM-2

13. PRISM-2 Muon decay channel ◆ Curved solenoid  1T, r=45cm, R=5m  50deg curve  Transmission  90% for 0.7 Gev/c- 1.1 GeV/c pion 800  mm.mrad 350 MeV/c<p  <650 MeV/c

14. PRISM-2 phase rotator ◆ Use the 1st ring of Japanese NF as PRISM- 2 phase rotator  0.3 - 1.0 GeV

15. Mu-edm storage ring ◆ =10 m ◆ B=0.25 T, E=2 MeV/m ◆ 800 p mm.mrad ◆ Δp/p=2% ◆ Tune x=4.42, y=4.2 ◆ Beta function x=6.85 m, y=7.1 m

16. Experimental Site

17. Systematics ◆ Non-planar (NP) systematics  E field at not in a median plane  Muon orbit is not in a median plane ◆ How to control?  Inject muons into clockwise(CW) and counter-clockwise(CC)  Benchmark with deuteron beam

18. ◆ edm = muon edm ×β ◆ Deutron NP = muon NP ×muon-γ 2  E=aBcβγ 2

19. Summary ◆ d  10 16 /year ◆ P  (PRISM) > 0.3 ◆ N  (PRISM) > 10 12 @500 MeV/c ◆ PRISM-2 ring (1st ring of the JNF)