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High Energy Particle Physics Lab (N)
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A high energy physics lab that explores the world of elementary particles through accelerator experiments.
AboutAbout the lab
Exploring the world of elementary particles through accelerator experiments.
The High Energy Particle Physics Lab (N Lab) explores the ultimate nature of matter and the laws of nature through experiments using state-of-the-art particle accelerators.
The lab works on the B-factory experiment at KEK, the LHC ATLAS experiment at CERN, and the muon g-2/EDM precision measurement experiment at J-PARC.
Aiming to open up a new physics world beyond the Standard Model, the lab states that discovering new phenomena would let it approach open questions such as the identity of dark matter and the origin of the masses and generation structure of elementary particles.
The detectors for the Belle and ATLAS experiments were also designed and built by the researchers themselves.
Key terms
- Standard Model
- A theory consisting of quarks, leptons, gauge bosons, and the Higgs boson that explains many known elementary particle phenomena.
- CP Violation
- The difference between the physical laws acting on a particle and those acting on its antiparticle.
- Anomalous Magnetic Moment
- The deviation of an elementary particle's magnetic property (the g-factor) from 2. It can be calculated with high precision in the Standard Model.
- Trigger
- A mechanism for efficiently selecting extremely rare events from an enormous number of collisions.
NewsLab news
Cooled muons accelerated to 0.3 MeV in joint research with J-PARC and others
Paper published in Optics and Lasers in Engineering
Belle II experiment accumulates the world's largest Υ(4S) dataset
Paper published in Physical Review D
ResearchResearch themes
With the world's highest-intensity B-factory experiment and the world's highest-energy LHC experiment as its two pillars, the lab aims to resolve unsolved problems of the Standard Model and discover a new world of particles. It also works on detector development and on computing systems for data analysis.
*Illustrative imageSearching for New Physics with the Belle II Experiment
As a core university group, the lab promotes the SuperKEKB/Belle II experiment at KEK, carrying out precision measurements of the Standard Model and searches for new physics. Using B meson decays and other processes, it has also made the measurements needed to test CP violation.
*Illustrative imageSearching for New Particles in the LHC ATLAS Experiment
The lab participates in the ATLAS experiment at the LHC, the world's highest-energy proton-proton collider, at CERN in Switzerland. It is pursuing searches for supersymmetric particles and extra dimensions, measurement of the coupling constant of the Higgs boson decaying into muon pairs, and precision measurement of top quark pair production.
*Illustrative imagePrecision Measurement of Muon g-2/EDM
In an experiment being prepared at J-PARC in Tokai Village, Ibaraki Prefecture, the lab precisely measures the muon's anomalous magnetic moment (g-2) and electric dipole moment (EDM) to search for new physics. It takes part in research and development of the target used to cool muons and of beam monitors for the re-acceleration accelerator.
*Illustrative imageDevelopment of Detectors and Trigger Circuits
In the Belle II experiment, the lab has long developed the "TOP counter," a new device for identifying particle types. In the ATLAS experiment, it works on developing, operating, and improving the circuits of the muon trigger, which selects extremely rare events.
MembersFaculty
The members of the High Energy Particle Physics Lab consist of faculty, project researchers, and doctoral, master's, and undergraduate students.As of 2026
- ProfessorToru Iijima
- Project ProfessorKodai Matsuoka
- Associate ProfessorKenji Inami
- Associate ProfessorYasuyuki Horii
- Associate ProfessorVinicius Mikuni
- Project Associate ProfessorKazuhito Suzuki
- Project Assistant ProfessorHikari Murakami
- Project Assistant ProfessorShota Izumiyama
- Project Assistant ProfessorYusuke Takeuchi
- Project Assistant ProfessorPeter Rados
- Project Assistant ProfessorSaurabh Dey
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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: “Accelerator Desy 2” Milkodromeda / CC BY-SA 4.0 (cropped)
- Searching for New Physics with the Belle II Experiment: “KEK Belle II Detector (2)” Kestrel / CC BY-SA 4.0 (cropped)
- Searching for New Particles in the LHC ATLAS Experiment: “CERN ATLAS Detector” SimonWaldherr / CC BY-SA 4.0 (cropped)
- Precision Measurement of Muon g-2/EDM: “J-PARC Surface Muon Beamline” Kestrel / CC BY-SA 4.0 (cropped)
- Development of Detectors and Trigger Circuits: “Photomultiplier Tube (PMT)” Motokoka / CC BY-SA 4.0 (cropped)
- Related lab (Elementary Particle Properties (Φ) Lab): “Institute of nuclear and particle physics 00048 REP SDR-62 (0659)” DimitrisSideridis / CC BY-SA 4.0 (cropped)
- Related lab (Cosmic Ray Physics (CR) Lab): “The Alpha Magnetic Spectrometer (AMS), a cosmic particle detector (iss075e0086247)” NASA Johnson Space Center / Public domain (cropped)
- Related lab (Elementary Particle Theory (E) Lab): “Fermilab - CDF detector rolling in for run 2” 作者不詳 / Public domain (cropped)
- Related lab (Quark-Hadron Theory (H) Lab): “-A4-at-144-dpi” Pcharito / CC BY-SA 3.0 (cropped)
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