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Saito Lab
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The lab measures the spin of the muon with high precision to search for physics beyond the Standard Model.
AboutAbout the lab
Measuring muons precisely, beyond the Standard Model
The Saito Lab searches for physical phenomena beyond the Standard Model of particle physics through precision measurements of spin-related quantities.
The lab is currently working on ultra-precise measurements of the muon's anomalous magnetic moment and electric dipole moment.
At the new muon beamline at J-PARC, the lab is working to carry out the world's first demonstration of muon cooling and acceleration.
Because the lab is located within a research institute, students can conduct research surrounded by experts in accelerators, superconductivity, mechanical engineering, and other fields.
Key terms
- Muon
- An elementary particle in the same family as the electron but much heavier. It decays into other particles within a short time.
- Standard Model
- The theory that forms the foundation of present-day particle physics, explaining elementary particles and the forces that act between them.
- Anomalous magnetic moment
- A quantity that shows how much the strength with which an elementary particle behaves as a magnet deviates from the prediction of the basic theory.
NewsLab news
A master's student won the Excellent Poster Presentation Award (Experiment) at FPWS2024
A doctoral student won the Outstanding Student Presentation Award at the Annual Meeting of the Physical Society of Japan
A doctoral student won the Annual Meeting Award of the Particle Accelerator Society of Japan
ResearchResearch themes
Through precision measurements of spin-related quantities, the lab experimentally investigates physical phenomena beyond the Standard Model of particle physics and the laws behind them. Its current work is the ultra-precise measurement of the muon's anomalous magnetic moment and electric dipole moment.
*Illustrative imageMuon Cooling and Acceleration
At the new muon beamline at J-PARC, the lab develops and demonstrates the world's first cooling and acceleration of muons. Muons that have been brought to rest are accelerated in stages by a linear accelerator.
*Illustrative imageSilicon Tracking Detector
The lab develops silicon detectors to measure the tracks of the positrons produced when muons decay. The integrated circuits that read out the signals are also custom-designed for this experiment.
*Illustrative imageMagnetic Field Measurement
The precision of the measurement depends on how the magnetic field is measured. The lab develops devices such as an NMR-based standard probe so that the magnetic field inside the storage magnet can be measured with high accuracy.
MembersFaculty
The members of the Saito Lab consist of faculty, doctoral and master's students, affiliated staff, and cooperating staff.As of 2026
- ProfessorNaoto Saito
- ProfessorTsutomu Mibe
- Assistant ProfessorShusei Kamioka
- Assistant ProfessorShinji Ogawa
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “J-PARC Surface Muon Beamline” Kestrel / CC BY-SA 4.0 (cropped)
- Muon Cooling and Acceleration: “The 805 MHz side-couple cavities” Z22 / CC BY-SA 4.0 (cropped)
- Silicon Tracking Detector: “FZU DetectorTesting PJachimova 9” Akademie věd České republiky / Czech Academy of Sciences (Pavlína Jáchimová) / CC BY-SA 3.0 (cropped)
- Magnetic Field Measurement: “Nuclear Magnetic Resonance Laboratory” Shandchem from Scotland / CC BY 2.0 (cropped)
- Related lab (Hamaguchi Lab): “Cosmic web” Volker Springel / Max Planck Institute For Astrophysics / CC BY-SA 4.0 (cropped)
- Related lab (Liang Lab): “NuclideMap stitched 2” NuclideMap.PNG: The viewer derivative work: Neokortex (talk) / Public domain (cropped)
- Related lab (Moroi Lab): “Bullet Cluster with DECam (noirlab2603a)” CTIO/NOIRLab/DOE/NSF/AURA Image Processing: T.A. Rector (University of Alaska Anchorage/NSF NOIRLab) & M. Zamani (NSF NOIRLab) / CC BY 4.0 (cropped)
- Related lab (Fundamental Symmetry Lab): “Cold atoms experiment 04” Tomasz Kawalec / CC BY-SA 4.0 (cropped)
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