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Experimental Particle Physics Lab
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A lab that uses experiments to explore the properties of elementary particles and unknown interactions.
AboutAbout the lab
Probing the fundamental constituents of everything in search of unknown interactions
The Experimental Particle Physics Lab aims to use experiments to uncover the nature of elementary particles, the basic building blocks of the universe, and the interactions that act between them.
The lab pursues its research through three approaches: precision measurement of neutrino oscillations, high-energy particle collisions, and searches for extremely rare phenomena.
Alongside physics analysis, members also develop the high-performance detectors and electronics used in the experiments themselves.
Key terms
- Standard Model
- The theory describing elementary particles and fundamental forces. It explains many experimental results with high precision, but cannot explain the nature of dark matter
- Higgs boson
- The particle that gives mass to elementary particles. It appears in the Standard Model
- CP violation
- The phenomenon in which the laws of physics differ between particles and antiparticles. It offers a clue to the mystery of why matter, rather than antimatter, remained in the universe
NewsLab news
Paper by a doctoral student published in Progress of Theoretical and Experimental Physics
A doctoral student received the Student Excellent Presentation Award (Experimental Nuclear Physics) at the 80th Annual Meeting of the Physical Society of Japan
A doctoral student received the Student Best Presentation Award at FTT2025
Research results by Assistant Professor Takashi Iida issued as a press release
The four major LHC experiments, including the ATLAS experiment in which lab members participate, received the 2025 Breakthrough Prize
ResearchResearch themes
A major challenge in particle physics is to study the properties of elementary particles in greater detail and to uncover new physics beyond the Standard Model. The lab takes on this challenge through three approaches: accelerator-based neutrino experiments, collider experiments, and rare-event search experiments.
*Illustrative imagePrecisely measuring neutrino oscillations
The lab participates in the T2K experiment, in which a neutrino beam from J-PARC is observed by a detector in Hida, Gifu Prefecture, about 300 km away, and in the next-generation Hyper-Kamiokande experiment. Its major goal is to discover "CP violation" by precisely comparing the oscillations of neutrinos and antineutrinos.
*Illustrative imageColliding particles to search for new particles
The lab has taken part in the CDF experiment at Fermi National Accelerator Laboratory in the US and the ATLAS experiment using the LHC at CERN in Europe. It continues to work on ATLAS, carrying out precision measurements of the Higgs boson and other particles and searching for unknown particles and phenomena.
*Illustrative imageSearching for extremely rare phenomena
The lab is running the COBAND experiment, which searches for the radiative decay of the cosmic neutrino background and precisely measures the resulting decay photons, and the PIKACHU experiment, which searches for the double beta decay of atomic nuclei. Discovering such an extremely rare phenomenon would provide clues for understanding new physics beyond the Standard Model.
*Illustrative imageBuilding detectors to capture new physics
The lab handles the whole process, from developing new detectors and electronics to designing and fabricating the actual instruments, building, operating them, and acquiring data. It develops silicon semiconductor detectors for the ATLAS experiment and the superconducting tunnel junction (STJ) detector for the COBAND experiment.
MembersFaculty
The members of the Experimental Particle Physics Lab are faculty members, doctoral, master's, and undergraduate students, and administrative assistants.As of 2026
- ProfessorKen Sakashita
- Associate ProfessorYuji Takeuchi
- LecturerKoji Sato
- Assistant ProfessorTakashi Iida
- Specially Appointed ProfessorShinhong Kim
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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: “CERN Geneva, Neutrino detections chamber at protoDUNE experiment, seen from outside, Dec 2023 (Mark Benecke)” Markbenecke / CC BY-SA 4.0 (cropped)
- Precisely measuring neutrino oscillations: “Photomultiplier Tube (PMT)” Motokoka / CC BY-SA 4.0 (cropped)
- Colliding particles to search for new particles: “CERN LHC CMS 11” SimonWaldherr / CC BY-SA 4.0 (cropped)
- Searching for extremely rare phenomena: “Cosmic Microwave Background (CMB)” ESA and the Planck Collaboration / CC BY 4.0 (cropped)
- Building detectors to capture new physics: “BOL-detector with legs and cabling” René van Dantzig / CC0 (cropped)
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): “Jefferson Lab Thomas Jefferson National Accelerator Facility, in Virginia ( )” doe-oakridge / Public domain (cropped) - Related lab (原子核理論グループ（原子核理論研究室）
): “Institute of nuclear and particle physics 00048 REP SDR-65 (0666)” DimitrisSideridis / CC BY-SA 4.0 (cropped) - Related lab (高エネルギー原子核グループ): “CERN ALICE Experiment” Johannes Vogel / CC BY-SA 3.0 (cropped)
- Related lab (ナノ構造物性研究室): “Fullerene-C70-3D-sticks” Jynto (talk) / CC0 (cropped)
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