Motivation
Testing Fundamental Symmetries:
• CPT Invariance is a fundamental property of QFT
• Properties of the hydrogen atom are among the most precisely measuredquantities in physics
• Hydrogen-antihydrogen comparison may provide one of the best tests of CPTinvariance
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ALPHA Program
• 1S-2S Spectroscopy
• Lyman-Alpha Spectroscopy and Cooling
• Microwave Spectroscopy
• Charge neutrality test
• ALPHA-g: Test of gravity with antihydrogen
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ALPHA-2 Apparatus
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Trapping Magnetic Field
05
1015
20
Rad
ial p
ositi
on (m
m)
200
0
- 200
Axial position (mm)
1.0
1.5
2.0M
agne
ticfie
ld (T
)
cb
da
Pro
babi
lity
Frequency
1420.4 MHz
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Experimental ResultsNature, 2017
This represents the first observed spectrum of antiatoms. Hyperfine splitting determined towithin 500 KHz, 200 times more precise than the previous publication.
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Summary
ALPHA has been testing matter-antimatter symmetry in various ways.Our latest microwave spectroscopy publication achieved a factor of 200 precision overour first measurement.
A new measurement addressesseveral key systematics (currentlyunder analysis):– The magnetic field drift within asequence– The drift of the external solenoidbetween runs
We expect a 20-fold improvement in precision.
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Prospects for Microwave Measurements
• Development for a future NMR transition measurement is on-going
• With ever higher trapping rates, better field control, and possible laser coolingapplications we hope to achieve even higher precisions
• Testing CPT invariance to even higher precision, we are pushing the frontiers ofhuman knowledge
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Acknowledgements
ALPHA Canada Collaborators:P. A. Amaudruz, D. Bishop, A. Capra, R. Collister, M. Constable, A. Evans, N. Evetts, W. Faszer, S. Freeman,M. C. Fujiwara, D. R. Gill, M. Grant, W. N. Hardy, M. E. Hayden, R. Henderson, A. Khramov, L. Kurchaninov,P. Lu, L. Martin, N. Massacret, M. Mathers, J. T. K. Mc Kenna, S. Menary, T. Momose, J. J. Munich, K.Olchanski, A. Olin, K. Ong, L. Paulson, B. Shaw, D. Starko, C. So, J. E. Thompson, R. I. Thompson, E. Zaid.
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Supplementary: ALPHA Program
• 1S-2S Spectroscopy
– Nature, 2017; Nature, 2018
• Lyman-Alpha Spectroscopy and Cooling
– Nature, 2018
• Microwave Spectroscopy– Nature, 2012; Nature, 2017
• Charge neutrality test
– Nature, 2016
• ALPHA-g: Test of gravity with antihydrogen
– Please see poster by Phillip Lu
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Supplementary: New Preliminary Results
New measurementaddresses several keysystematics (currentlyunder analysis):– The magnetic field driftwithin a sequence
12 | IPR Particle Physics 2018 J. J. Munich
Supplementary: New Preliminary Results
New measurementaddresses several keysystematics (currentlyunder analysis):– The magnetic field driftwithin a sequence– The drift of the externalsolenoid between runs
We expect a 20-foldimprovement in precision.
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Supplementary: Further Microwave Measurements
NMR measurement is insensitive to first order to external magnetic field.
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