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PRISM-II and Measurement of Muon Electric Dipole Moment based on J-PARC mu-edm LoI

PRISM-II and Measurement of Muon Electric Dipole Moment based on J-PARC mu-edm LoI. NuFACT-J'03 M. Aoki Osaka University. Contents. Muon electric dipole moment Concept of the mu-edm measurement PRISM-II Muon storage ring Experimental Site Control of the systematics Summary.

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PRISM-II and Measurement of Muon Electric Dipole Moment based on J-PARC mu-edm LoI

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  1. PRISM-II and Measurement of Muon Electric Dipole Momentbased 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

  5. ~ ~ ~ ~ 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

  6. g-2 and muon-EDM in SUSY • am(SM(DEHZ))-am(Exp) = (33.9±10.6)x10-10 • dm < 10-20 e.cm

  7. 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

  8. キャンセル電場 • E=aBcβγ2 E=2 MeV/m、B=0.25 T • Edm電場 • E=Bcβ B=0.25 T → E=72 MeV/m

  9. PRISM for mu-edm • Accelerate low energy muon upto 500 MeV/c • Initial muon ~1011 • Decay survivability ~6% • Polarization ~0.2? • NP2 = 108 毎秒 • 一方、 • dm<10-24 e.cm → NP2>1016 total 20 - 500 MeV PRISM

  10. PRISM-2 for mu-edm • Accept 500 MeV/c muons and phase rotate • Initial muon ~2×1010 • Decay survivability ~56% • Polarization ~0.6 • NP2 = 109~1010 毎秒 • Transverse 800 p mm.mrad • Momentum acceptance ±30% PRISM-2

  11. 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 p mm.mrad 350 MeV/c<pm<650 MeV/c

  12. PRISM-2 phase rotator • Use the 1st ring of Japanese NF as PRISM-2 phase rotator • 0.3 - 1.0 GeV

  13. Mu-edm storage ring • <R>=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

  14. Experimental Site

  15. 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

  16. edm = muon edm ×β • Deutron NP = muon NP ×muon-γ2 • E=aBcβγ2

  17. Summary • dm < 10-24 e.cm → NP2 > 1016/year • Pm(PRISM) > 0.3 • Nm(PRISM) > 1012 @500 MeV/c • PRISM-2 ring (1st ring of the JNF)

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