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Particle Physics Theory Lab
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A lab that explores elementary particles, the basic building blocks of the universe, through theory.

AboutAbout the lab
Approaching the fundamental laws of nature through particle theory
The Theoretical Particle Physics Lab conducts theoretical research on elementary particles, the basic building blocks of the universe.
Building on past theoretical and experimental research, the lab tries to answer "ultimate questions" such as what the world is made of and how those constituents interact.
Research is carried out in quantum field theory, physics beyond the Standard Model, and particle phenomenology and cosmology based on superstring theory.
In the fourth-year special research project, students usually spend the whole year in a reading group going through introductory books on field theory, superstring theory, and particle physics.
Key terms
- Quantum field theory
- A theory whose equations are nonlinear equations containing an infinite number of variables. Perturbation theory is a representative approximation method
- Standard Model
- The most fundamental physical theory verified by experiments so far. It correctly describes physics down to about 10^-18 meters
- Superstring theory
- The leading candidate for a unified theory that describes the four forces in a quantum-mechanical way. It takes "strings," rather than point-like particles, as the fundamental elements
NewsLab news
A paper co-authored by lab members was selected as an Editor's Choice in PTEP
A paper on lepton flavor structure using diffusion models was published in Physical Review D
Associate Professor Yuya Kusuki received the 22nd JSPS Prize from the Japan Society for the Promotion of Science
A paper on searching for axion models using reinforcement learning was published in Journal of High Energy Physics
ResearchResearch themes
The lab studies elementary particles, the basic building blocks of the universe, from the theoretical side, exploring what the world is made of, how those constituents interact, and what laws lie behind them. The research is divided into quantum field theory, physics beyond the Standard Model, and particle phenomenology and cosmology based on superstring theory.
*Illustrative imageNonperturbative studies of quantum field theory
To investigate from first principles phenomena that cannot be understood with perturbation theory, the lab studies nonperturbative formulations of quantum field theory. A nonperturbative formulation of the Standard Model itself is not known, and the problem is deeply related to a phenomenon called anomalies.
*Illustrative imagePhysics beyond the Standard Model
The lab focuses on how "electroweak symmetry breaking," which is the origin of the mass of all particles, is realized, and considers the physics behind it and ways to test it through experiments and observations. It also regards clarifying the origin of neutrino masses and the origin of dark matter as important.
*Illustrative imageParticle phenomenology based on superstring theory
The lab focuses on the geometric structure of the six-dimensional extra-dimensional space (compact space) predicted by superstring theory, and studies how it relates to things such as the number of particle generations and the strengths of couplings. It also uses machine learning and deep learning to search for compact spaces.
MembersFaculty
The members of the Theoretical Particle Physics Lab are faculty, academic researchers and joint researchers, doctoral, master's, and undergraduate students, and professors emeritus.As of 2026
- ProfessorHiroshi Suzuki
- Associate ProfessorKoji Tsumura
- Associate ProfessorMotoko Fujiwara
- Associate ProfessorYuya Kusuki
- Associate ProfessorJustin Kaidi
- Assistant ProfessorHajime Otsuka
- Assistant ProfessorYuichi Koga
- Assistant ProfessorYuma Furuta
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Report an errorAbout the images
For images provided to us or used with permission, the source is listed on each line. Wikimedia Commons images are illustrative and were not taken at the lab (they are cropped). Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Elementary Particle Interactions” ParticlesAndMath / CC BY-SA 4.0 (cropped)
- Nonperturbative studies of quantum field theory: “Feynman Diagramme Muon Anomalie” B. Abi und Kollegen. Sie angegebene Rechte zur Veröffentlichung mit der angegebenen URL / CC BY-SA 4.0 (cropped)
- Physics beyond the Standard Model: “CERN LHC Tunnel1” Julian Herzog (Website) / CC BY-SA 3.0 (cropped)
- Particle phenomenology based on superstring theory: “Calabi-Yau” Lunch / CC BY-SA 2.5 (cropped)
- Related lab (量子宇宙物理理論研究室): “Universum” Heikenwaelder Hugo, Austria, , www.heikenwaelder.at / CC BY-SA 2.5 (cropped)
- Related lab (粒子系理論物理学): “Cosmic Microwave Background (CMB)” ESA and the Planck Collaboration / CC BY 4.0 (cropped)
- Related lab (実験核物理研究室): “Tandem accelerator at Kyushu University” 九州大学 実験核物理研究室 / 提供:九州大学 実験核物理研究室 (cropped)
- Related lab (理論核物理研究室): “The Crab Nebula (weic2326a)” NASA, ESA, CSA, STScI, T. Temim (Princeton University) / CC BY 4.0 (cropped)
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