Transcript J-PARC MUSEにおけるミュオニウム超微細構造の精密測定

Present status of Mu HFS
experiment at J-PARC
K.Shimomura (KEK)
[email protected]
2015/7/16
Lepton moments 2014
Present status of MuSEUM
at J-PARC
MuSEUM (Muon Spectroscopy Experiment Using Microwave )
K.Shimomura (KEK)
[email protected]
2015/7/16
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Mu ground state
DEHFS: Mu Hyperfine Structure
m+
Zeeman Splitting
e-
4463 MHz
m+
Pure letron
= M point partcile
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e-
n12+n34=DEHFS
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n12-n34 ∝ mm/mp
• 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
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Recent Summary of exp. and th.
(by D.Nomura)
Exp. nHFS(exp)
4463.302 765(53) MHz [12 ppb]
The. nHFS(theory) 4463.302 891 (272) [63 ppb]
nHFS(QED)
4463.302 720 (253)(98)(3)
(mm/me)(QED)(a)
nHFS(weak)
-65
nHFS(had v.p)
232(1)
nHFS(had. h.o)
5
QED calculation →10 Hz accuracy within a
few years. (by Eides)
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Ratio of gyromagnetic moment
mm/me
mm/mp, am, mp/mB
206.7682670(55)
[27 ppb]
Mu 1S-2S
mSR
in Br2
MuHFS
Breit Rabi
MuHFS
Dn(theory)
Muon mass (CODATA2010) determiend by MuHFS(LAMPF1999)
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Why Muonium HFS measurement is so important？
• g-2 E821(BNL) 0.5ppm 3s deviation
μ+
-measurement of the deviation of muon spin direction(wqs)
B
and muon momentum direction(wc) wa∝(g-2)/2=am
e   
1   


   E 
 wa =
a
B
a
 m
m
2

mc 
 -1 


am an independent precise muon mass measurement is required
-The ratio to proton NMR frequency is important!
⇒
R
am =
-R
From g-2 strage ring
ωa
R
ωp
mm

mp
From Muonium HFS
 eB 
am 

a
a
wa
mc 

=
= m = m
wL (m )
 eB   g m  1 + am
gm 
  
 2mc   2 
wa w L ( p ) wa m p
=
=
= R /
wL ( p) wL ( m ) w p m m
mm/mp accuracy from direct measurement 120ppb
W. Liu et al., Phys. Rev. Lett. 82, 711 (1999).
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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
~m
b3 /p=-dDn12=dDn34
These value might change in sidereal time
(23h56m)
LAMPF Exp. Figure of Merit
2 (b m + X ) 2 + (b m + Y ) 2 / mm  5 10 -22
mm/MP～10-20
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Plank scale sensitivity
Method
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Improvement of statistics
LAMPF exp.
d(mm/mp)
d(Dn)
Statistics
Statistics
10.9 ppb
Magnetic field
Kr Density/Pressure
Muon stopping
RF power
LAMPF DC 107 /s
total 1013
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107 ppb
56 ppb
4.4 ppb
Muon stopping
13 ppb
Kr Density/Pressure
11 ppb
RF power
9.6 ppb
1.0 ppb
0.96 ppb
x200
J-PARC/MUSE Pulse 1x108 /s
H-Line
total 2x1015
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Systematic error
LAMPF d(mm/mp)
Statistics
J-PARC MUSE
107 ppb
x200
DC 107/s total 1013
Magnetic field
Muon stopping
13 ppb
11 ppb
Cavity length 159.73mm
RF power
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Pulse 108/s total 2x1015
Uniform Field (<1 ppm)
+ Stability
56 ppb
accuracy 5 mm
Kr Density/Pressure
Intense pulsed beam
9.6 ppb
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Beam profile moniter
(accuracy～1 mm)
Long RF cavity
（～300 mm)
RF Input：Coaxial cable
Key Component
• Intense Muon Beam Line
• MuHFS S.C.Magnet
• RF cavity
• Kr chamber
• Positron Detector
• Profile Monitor
• Systematic Error Study
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Kawamura ,Toyoda
Sasaki,Mizutani,Ueno,Higashi
Tanaka,Matsuda
Tanaka,Torii,Strasser
Knada,Fukao,Mibe
Tajima,Toyoda,Ito
Tanaka, Knada,Ishida
Kawamura,Toyoda,
Bird’s
eye photo in Feb. 2008
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S.C. Magnet (MRI magnet)

0.03 ppm/h

35cm DSV <1ppm

Effective bore radius 680mm

Multi NMR probe for precise field
Sasaki,Mizutani,Ueno
maeasurement
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two transitions
Tanaka,Matsuda,Torii
RFtwo
cavity
resonance modes
Input
TM110
40
Monitor
Energy (GHz)
20
0
TM210
-20
-40
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0
1.0
2.0
B(T)
Tuning
Tuning
Monitor
Input
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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
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RF cavity
MWS simulation
3D CAD
Test Cavity
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Positron Detector
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Kanda,Mibeuda,Kojima
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
FBPM
• 2D monitor (pulse by pulse)
• less than 300 mm thickness in total
• work under a magnetic field
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TBPM
• 3D monitor (time by time)
• 0-2 atm Kr gas pressure
• size < 200 mm (RF cavity )
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FBPM
MAPMT
Plastic Scintillator 0.15 mmt
Challenge 1
Uniform muon beam
range
uniform thickness
MA
PMT
MA
PMT
Challenge 2
Enough light
transmission
light guide or fiber
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MAPMT
Optical fiber
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FBPM
Proto type
fiber
light guide
0.15 mmt w.Al
0.15 mmt w.o.Al
Sheet plastic scinti.
6 mm width,
180 mm length
5m Fiber 5 m
Multi anode PM
0.15 mmt w.Al
Acryl
Light guide
Check List
0.1 mmt w.o Al
0.15 mmt w.Al
0.2 mmt w.o Al
0.2 mmt w.Al
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• Effect of Al coating
• Thickness dependence
• light guide selection
• position dependence
Beam Profile Measurement at D line
1mm accuracy is achieved..
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TBPM (IIT muon beam profile monitor)
Image intensifier (IIT)
CCD
camera Lens
Black sheet
Muon beam
Lens
vacuum
Flypast chamber (head)
100ns
DG535
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Plastic scintillator
EJ-212, f130, t2
Guide (cardboard)
Acryl. flange
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TBPM
Setup
Scintillator plate
Scintillation light
lenz
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ＩＩＴ
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lenz
ＣＣＤ
Y
Image of Muon Beam at D line
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X
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3D Image in Air
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Systematic Error
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Tanaka,Kanda,Ishida
Systematic Error
Magnetic Field
RF power
Kr gas temp.
Kr gas pressure
H impurity
Accuracy
v12
and
v34
HFS
60ppb
0.10%
0.1度
0.01hPa
<50ppm
0.0ppb
10Hz 2.0ppb
< 1Hz 0.2ppb
1Hz 0.2ppb
1Hz 0.5ppb
Tanaka,Kanda,Ishida
mm/mp
30ppb
20ppb
2ppb
0ppb
0ppb
Quaduratic
dependence
5Hz
1.0ppb
5ppb
Muonim
1mm
position(x,y)
Muonim position(z) 1mm
3Hz
0.6ppb
6ppb
< 1Hz 0.2ppb
2ppb
Beam line
Detector pile up
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10(e-4)
< 1Hz 0.2ppb
2ppb
2.5Hz 0.5ppb
3ppb
0.3Hz <0.1ppb <1ppb
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Summary and Next Step
Total systematic error is roughly estimated
HFS
2.4ppb
Magnetic moment
38ppb
RF power
→ need more study
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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
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...
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Close relationship to gm-2
am=(gm-2)/2
Exp.
0.001 165 920 89 (68)
[580 ppb]
3.2 s
The.
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0.001 165 918 28 (49)
[420 ppb]
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am=R/(-R)
Rexp(gm-2): 500 ppb
exp(MuHFS): 120 ppb