1. Present status of Mu HFS experiment at J-PARC
K.Shimomura (KEK)
2019/1/2
Lepton moments 2014

2. K.Shimomura (KEK) Koichiro.shimomura@kek.jp
Present status of MuSEUM at J-PARC MuSEUM (Muon Spectroscopy Experiment Using Microwave )
K.Shimomura (KEK)
2019/1/2
Lepton moments 2014

3. Mu ground state e- m+ e- m+ 4463 MHz DEHFS: Mu Hyperfine Structure
Zeeman Splitting e- m+
4463 MHz e- m+
Pure letron
= M point partcile
n12+n34=DEHFS
n12-n34 ∝ mm/mp
2019/1/2
Lepton moments 2014

4. Muonium ground state hyperfine interval measurement is related to
・Precise check of bound QED
・ Basic input parameter for muon
g-2 experiment
・Test of CPT and Lorentz Invariance
2019/1/2
Lepton moments 2014

5. Recent Summary of exp. and th. (by D.Nomura)
nHFS(exp) (53) MHz [12 ppb]
The.
nHFS(theory) (272) [63 ppb]
nHFS(QED) (253)(98)(3)
(mm/me)(QED)(a)
nHFS(weak)
nHFS(had v.p) (1)
nHFS(had. h.o)
QED calculation →10 Hz accuracy within a few years. (by Eides)
2019/1/2
Lepton moments 2014

6. Ratio of gyromagnetic moment
mm/me
mm/mp, am, mp/mB
(55)
[27 ppb]
Mu 1S-2S
mSR
in Br2
MuHFS
Breit Rabi
MuHFS
Dn(theory)
Muon mass (CODATA2010) determiend by MuHFS(LAMPF1999)
2019/1/2
Lepton moments 2014

7. Why Muonium HFS measurement is so important？
g-2 E821(BNL) 0.5ppm 3s deviation
-measurement of the deviation of muon spin direction(ws)
and muon momentum direction(wc) wa∝(g-2)/2=am　
　 -The ratio to proton NMR frequency is important!
　mm/mp accuracy from direct measurement 120ppb　
W. Liu et al., Phys. Rev. Lett. 82, 711 (1999). q
am an independent precise muon mass measurement is required ⇒
From g-2 strage ring
From Muonium HFS
2019/1/2
Lepton moments 2014

8. Test of CPT and Lorentz Invariance
CPT broken Theory⇒Lorentz symmetry is broken
O.W.Greenberg PRL89(2002)231602
CPT violation search
Ex., Muon difference gm+　/gm- 10-8
gm-2/MuHFS precise measurement
Lorentz symmetry violating term in STE Lagrangian b
Corresponding MuHFS Dn12/34
These value might change in sidereal time
(23h56m)
b3m/p=-dDn12=dDn34 ~
LAMPF Exp.　Figure of Merit
Plank scale sensitivity
mm/MP～10-20
2019/1/2
Lepton moments 2014

9. Method
2019/1/2
Lepton moments 2014

10. Improvement of statistics
107 ppb
Statistics
Magnetic field
56 ppb
Kr Density/Pressure
11 ppb
RF power
9.6 ppb
d(mm/mp)
Muon stopping
13 ppb
d(Dn)
10.9 ppb
Statistics
4.4 ppb
Kr Density/Pressure
1.0 ppb
RF power
0.96 ppb
Muon stopping
LAMPF exp.
x200
LAMPF DC 107 /s
total 1013
J-PARC/MUSE Pulse 1x108 /s
H-Line total 2x1015
2019/1/2
Lepton moments 2014

11. Systematic error LAMPF d(mm/mp) J-PARC MUSE x200 Statistics 107 ppb
Intense pulsed beam
DC 107/s total 1013
Pulse 108/s total 2x1015
Uniform Field (<1 ppm)
+ Stability
Magnetic field
56 ppb
Beam profile moniter
(accuracy～1 mm)
Muon stopping
13 ppb
accuracy 5 mm
Kr Density/Pressure
11 ppb
Long RF cavity
（～300 mm)
Cavity length mm
RF power
9.6 ppb
RF Input：Coaxial cable
2019/1/2
Lepton moments 2014

12. Key Component Intense Muon Beam Line MuHFS S.C.Magnet RF cavity
Kr chamber
Positron Detector
Profile Monitor
Systematic Error Study
Kawamura ,Toyoda
Sasaki,Mizutani,Ueno,Higashi
Tanaka,Matsuda
Tanaka,Torii,Strasser
Knada,Fukao,Mibe
Tajima,Toyoda,Ito
Tanaka, Knada,Ishida
2019/1/2
Lepton moments 2014

13. Material and Life Science
J-PARC Facility
(KEK/JAEA)
Kawamura,Toyoda,
LINAC
3 GeV
Synchrotron
Neutrino Beam
To Kamioka
Material and Life Science
Facility
Main Ring
(30 GeV  50 GeV)
Hadron Hall
Bird’s eye photo in Feb. 2008
2019/1/2
Lepton moments 2014

14. S.C. Magnet (MRI magnet) Sasaki,Mizutani,Ueno 0.03 ppm/h
35cm DSV <1ppm
Effective bore radius 680mm
Multi NMR probe for precise field
maeasurement
2019/1/2
Lepton moments 2014

15. 2019/1/2
Lepton moments 2014

16. 2019/1/2
Lepton moments 2014

17. 2019/1/2
Lepton moments 2014

18. 2019/1/2
Lepton moments 2014

19. 2019/1/2
Lepton moments 2014

20. 2019/1/2
Lepton moments 2014

21. 2019/1/2
Lepton moments 2014

22. 2019/1/2
Lepton moments 2014

23. 2019/1/2
Lepton moments 2014

24. RF cavity Tuning Tuning Tanaka,Matsuda,Torii 2019/1/2
Lepton moments 2014

25. Improvement from LAMPF
Cavity Length
The transition frequency of muonium in gas vary with the gas pressure due to
atomic collision between Mu and Kr.
⇒Fitting 0.8 and 1.5 atm data, old quadratic dependence parameter was used
(Los Alamos)
⇒We need the data lower pressure for improved fiting
2019/1/2
Lepton moments 2014

26. RF cavity MWS simulation 3D CAD Test Cavity 2019/1/2
Lepton moments 2014

27. 2019/1/2
Lepton moments 2014

28. Positron Detector
Kanda,Mibeuda,Kojima
2019/1/2
Lepton moments 2014

29. Profile Monitor Tajima,Toyoda Ito@JAEA Kr chamber RF cavity
3rd maimum systemitic error 13 ppb
In Los Alamos exp.
accuracy 5 mm　→　1 mm
TBPM
FBPM
　2D monitor (pulse by pulse)
　less than 300 mm thickness in total
　work under a magnetic field
　3D monitor (time by time)
　0-2 atm Kr gas pressure
　size < 200 mm (RF cavity )
2019/1/2
Lepton moments 2014

30. FBPM MAPMT Plastic Scintillator 0.15 mmt Challenge 1 Uniform muon beam
range
uniform thickness MA
PMT
Challenge 2 MA
PMT
Enough light
transmission
light guide or fiber
Optical fiber
MAPMT
2019/1/2
Lepton moments 2014

31. FBPM Proto type fiber Sheet plastic scinti. light guide 6 mm width,
0.15 mmt w.Al
0.15 mmt w.o.Al
fiber
light guide
Sheet plastic scinti.
6 mm width,
180 mm length
5m Fiber 5 m
Multi anode PM
Check List
0.2 mmt w.Al
0.2 mmt w.o Al
0.15 mmt w.Al
0.1 mmt w.o Al
Acryl
Light guide
Effect of Al coating
Thickness dependence
light guide selection
position dependence
2019/1/2
Lepton moments 2014

32. Beam Profile Measurement at D line
1mm　accuracy is achieved..
2019/1/2
Lepton moments 2014

33. 2019/1/2
Lepton moments 2014

34. TBPM (IIT muon beam profile monitor)
Plastic scintillator
EJ-212, f130, t2
Image intensifier (IIT)
Black sheet
Muon beam
Lens
CCD
camera
vacuum
Lens
Flypast chamber (head)
100ns
DG535
Guide (cardboard)
Acryl. flange
2019/1/2
Lepton moments 2014

35. TBPM Setup Scintillator plate Scintillation light lenz ＩＩＴ lenz ＣＣＤ
2019/1/2
Lepton moments 2014

36. Image of Muon Beam at D lineY X
2019/1/2
Lepton moments 2014

37. 3D Image in Air
2019/1/2
Lepton moments 2014

38. Systematic Error
Tanaka,Kanda,Ishida
2019/1/2
Lepton moments 2014

39. Systematic Error Accuracy v12 and v34 HFS mm/mp Magnetic Field 60ppb
Tanaka,Kanda,Ishida
Accuracy
v12 and v34
HFS
mm/mp
Magnetic Field
60ppb
0.0ppb
30ppb
RF power
0.10%
10Hz
2.0ppb
20ppb
Kr gas temp.
0.1度
< 1Hz
0.2ppb
2ppb
Kr gas pressure
0.01hPa
1Hz
0ppb
H impurity
<50ppm
0.5ppb
Quaduratic dependence
5Hz
1.0ppb
5ppb
Muonim position(x,y)
1mm
3Hz
0.6ppb
6ppb
Muonim position(z)
Beam line
10(e-4)
Detector pile up
2.5Hz
0.3Hz
<0.1ppb
3ppb
<1ppb
2019/1/2
Lepton moments 2014

40. Summary and Next Step Total systematic error is roughly estimated
HFS ppb
Magnetic moment ppb
RF power
→　need more study
2019/1/2
Lepton moments 2014

41. M.Aoki, Y.Fukao, A.Higuchi, Y.Higashi
Collaboration List
M.Aoki, Y.Fukao, A.Higuchi, Y.Higashi
H.Iinima, Y.Ikedo, K.Ishida, M.Iwasaki, R.Kadono, S.Kanda, O.Kamigaito, D.Kawall, N.Kawamura, K.Kojima, A.Koda, K.Kubo, R.Okubo, Y.Matsuda, T.Mibe, Y.Miyake, T. Mizutani, K.Nagamine, K.Nishiyama, T.Ogitsu, P.Strasser N.Saito, K.Sasaki, K.Shimomura, M.Sugano, M.Tajima,
K.Tanaka, D.Tomono, A.Toyoda, K.Torii, E.Torikai, K.Ueno, Y.Ueno, M.Yoshida, A.Yamamoto
2019/1/2
Lepton moments 2014

42. 2019/1/2
Lepton moments 2014

43. .
2019/1/2
Lepton moments 2014

44. Close relationship to gm-2
am=(gm-2)/2
Exp.
(68)
[580 ppb]
am=R/(l-R)
Rexp(gm-2): 500 ppb
3.2 s
lexp(MuHFS): 120 ppb
The.
(49)
[420 ppb]
2019/1/2
Lepton moments 2014