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MuSEUM and Its Systematic Uncertainty
Yasuhiro Ueno 上野恭裕 University of Tokyo Matsuda Lab. M1
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Today’s Menu
1. MuSEUM (motivation, set up, uncertainties)
2. Muon beam profile monitor(BPM) and beam test
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What Is MuSEUM Experiment?• Muonium Spectroscopy Experiment Using Microwave
• Precise measurement of muonium hyperfine structure (MuHFS) @J-PARC
Liu, et al. PRL82 771(1999)
Muonium
µ+
e- 1S F=1
F=0Δν
µ e
µ e
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– R. P. Feynman
“There is a reason physicists are so successful with what they do, and that is they study the hydrogen atom and the helium ion and then they stop."
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• Indeed! Hydrogen(-like) atom spectroscopy played an essential role in understanding physics (e.g.) Bohr Model, Lamb shift, bound QED… etc.
• The finite-size of proton, however, prevents physicists from testing quantum electrodynamics (QED).
• Muonium = positive muon (µ+) + electron (e-) → purely leptonic (two ‘point like’ particles)
Why Muonium Hyperfine Structure
https://www.youtube.com/watch?v=rc9gwPB78lk
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Why Muonium Hyperfine Structure
Stringent Test of Bound-State QED
Determination of Muon Mass
Muonium →Two point-like particles no proton structure effect
An external parameter for muon g-2 experiment@J-PARC(E34) or Fermilab
Contribution to new physics search
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Experimental Set Up
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How To Measure?
magnet
Gas Chamber
µ+
gas chamber
Kr gas
muon beam
positron detector
1.7T MagnetRF cavity
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How To Measure?
magnet
Gas Chamber
µ+e-
gas chamber
Kr
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magnet
Gas Chamber
Muonium
How To Measure?
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magnet
Gas Chamber
Muonium
e+
positron detector
How To Measure?
NO spin flip!!
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magnet
Gas Chamber
How To Measure?
RF cavity
If we add HFS
frequency…
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magnet
Gas Chamber
flip!!
RF cavity
How To Measure?
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magnet
Gas Chamber
RF cavity
e+
positron detector
How To Measure? The spin did flip!!
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Uncertainties
Liu, et al. PRL82, 711(1999)
muon stopping distribution
Previous experiment @Los Alamos Meson Physics Facility(LAMPF)
magnetic field
statistical to be suppressed
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Muon Beam Profile Monitor (BPM)
On-Line Beam Profile Monitor !Off-Line Beam Profile Monitor (Main Topic of today)
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• Designed and developed by S. Kanda (U. Tokyo)
• Composite of very thin (~100µm) scintillation fibers
On-line Beam Profile Monitor
S. Kanda. J-PARC symp.
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• design and development by T. U. Ito, JAEA
• Composite of Scintillator, Gated Image Intensifier (IIF) and CCD camera
• Determination of muon stopping distribution
Off-line 3D Beam Profile Monitor
S. Kanda. J-PARC symp.
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Beam Test @J-PARC
• Aim
• Establish the operation of beam profile monitor
• Evaluate the performance of the monitor
Photo credit, H. A. Torii
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Beam test
gas chamber
RF cavity
Scintillator
γµ
CCD camera
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Reconstruction of 3D Distribution
• Acquired image[mm]
[mm]
• Calibration for beam intensity is done
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Future Prospects
Operational test under magnetic field
Improvement of scintillation sector
Reconstruct the muon distribution
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Summary
• Aim of MuSEUM: determination of the values of muonium HFS
• Demonstration of beam profile monitor has been done
• Data analysis is ongoing
• Further study for muon stopping distribution and improvements follows
JPS @WASEDA, 21st MARCH, 2015 A.M.(DF room)
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THANK YOU FOR YOUR ATTENTION!!
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CPT and Lorentz invariance
• Hyperfine transition frequency can exhibit sidereal time oscillation as the earth rotates
• The bound of Lorentz violation parameter for muon sector (obtained from the previous Mu HFS)
R. Bluhm. “Testing Lorentz and CPT Symmetry”, http://users.ictp.it/~smr1951/Programme_files/08-Bluhm.pdf
(2008), Jan 25, 2015.V. W. Hughes, et al. PRL87, 11(2001)
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Muon mass
• LAMPF experiment (last MuHFS experiment) decided mµ (120 ppb)
• CODATA mµ →30 ppb
• CODATA = LAMPF+other theoretical calculations
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muonium HFS VS positronium HFS
• µµ/µp → contribution to g-2 experiment on µ+
• positronium HFS →strong recoil effect, annihilation effect
• positronium HFS uncertainty ~ppm
while muonium HFS uncertainty ~10 ppb
• positronium HFS ~200GHz muonium 4GHz
A. Ishida, Ph.D. Thesis, (2014)
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µµ/µp ratio
• With these assumption, we can determine the muon-proton magnetic moment ratio
• QED is correct
• No SUSY
• α and R∞ is well determined (i.e. they are external parameters)
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1s-2s VS HFS
• The energy scale of hyperfine splitting is much smaller than that of 1s-2s transition
• →better absolute energy resolution (i.e. better sensitivity to CPT and Lorentz violation)
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Beam test - Validation-Gas Pressure
0.1 0.3 0.5 0.7 1.0 [atm]
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Magnetic Field
• LAMPF experiment: the muon-stopping area excessed the area where magnetic field was precisely measured→Large uncertainty related to magnetic field
• MuSUEM suppress these uncertainties from both sides - magnetic field and muon stopping distribution
• Best effort has been (will be) done to reduce magnetic-field uncertainty
• To suppress the uncertainty from muon stopping distribution, Muon beam profile monitor is essential
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Why Muonium Hyperfine Structure
• Muonium HFS is a good probe for bound QED theory• the experiment also
determines muon mass →better input parameter for new muon g-2 experiment at J-PARC and Fermilab
!
• Test of CPT and Lorentz invariance
R. Bluhm, et al. PRL84, 1098(2000)P. Strasser, et al. Proceedings for NUFACT 2014, to be published in the Proceedings of Science.
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Statistic
• Last muonium HFS measurement was at LAMPF (Los Alamos Meson Physics Facility), USA
• The muonium HFS value by the LAMPF experiment is deteriorated by insufficient statistic
• H-Line is a new high-intensity muon pulse beam facility@ J-PARC
• The statistic acquired by H-line in four days is equal to the whole statistic of LAMPF experiment
• Reduction of systematic uncertainty is important