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Sato-Hiroshima Lab
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The lab approaches the fundamental laws of nature through an understanding of elementary particles and the universe.
AboutAbout the lab
Approaching the fundamental laws of nature through elementary particles and the universe
The Sato-Hiroshima Lab mainly studies particle physics and astrophysics.
The lab also participates in several international collaborative experiments, approaching the fundamental laws of nature from both theory and experiment.
It covers a wide range of topics, including the COMET experiment searching for muon-to-electron conversion, neutrino oscillations, grand unified theories, and dark matter.
On the lab's website, it is introduced under the name "Elementary Particle and Astrophysics Lab (Sato-Hiroshima Lab)."
Key terms
- Neutrino oscillation
- A phenomenon in which a neutrino changes its flavor (type) while traveling, due to its mass.
- Charged lepton
- Three types of light, electrically charged particles: the electron, muon, and tau.
- Grand unified theory
- Research based on the idea that the forces acting in nature originate from a single underlying law.
NewsLab news
A student was honored as a top-performing student and also received the CREATES Paper Award
A student received the Best Poster Award at COMET CM48
Associate Professor Nagisa Hiroshima received the 7th Fumiko Yonezawa Memorial Prize of the Physical Society of Japan
ResearchResearch themes
The lab studies the fundamental laws of nature, centered on particle physics and astrophysics. It also participates in several international collaborative experiments and works from both theoretical and experimental sides.
*Illustrative imageSearch for Charged Lepton Flavor Violation
The COMET experiment, now in preparation, will search for neutrinoless conversion of a muon to an electron with about 10,000 times the sensitivity of the currently published limit. The lab aims to achieve the target sensitivity through research on methods using deep learning, and also works on making the computational cost of simulations more efficient using statistical models.
*Illustrative imagePhenomenology of Neutrino Oscillations
This research uses neutrino oscillations to explore new physics beyond the Standard Model and the internal structure of the Sun. It is said to offer clues to understanding neutrino mass, and also to provide a way to probe regions inside the Sun that cannot be observed optically.
*Illustrative imageGrand Unified Theories of the Forces of Nature
The electromagnetic, weak, and strong forces are currently described by separate laws, but under extreme conditions such as the early universe, they may have behaved as a single force. The lab theoretically examines the classification of particles and new symmetries, aiming to derive predictions that can be tested experimentally.
*Illustrative imageCharged Lepton Physics
Charged leptons are three types of light, electrically charged particles (the electron, muon, and tau), and differences in their mass and lifetime are thought to be related to the fundamental structure of particles. Tiny discrepancies that existing theories cannot explain, such as the deviation in the muon's magnetic properties, are regarded as signs of new particles or unknown interactions.
MembersFaculty
Members of the Sato-Hiroshima Lab consist of faculty, doctoral, master's, and undergraduate students, research students, and interns.As of 2026
- ProfessorJo Sato
- Associate ProfessorNagisa Hiroshima
VoicesStudent voices
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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: “First neutrino observation” 作者不詳 / Public domain (cropped)
- Search for Charged Lepton Flavor Violation: “CMS muon chambers” zipckr / CC BY 2.0 (cropped)
- Phenomenology of Neutrino Oscillations: “IceCube Neutrino Observatory in 2023 02” Christopher Michel / CC BY-SA 4.0 (cropped)
- Grand Unified Theories of the Forces of Nature: “StandardModel” ParticlesAndMath / CC BY-SA 4.0 (cropped)
- Charged Lepton Physics: “Particle Tracks in AWAN Expansion Cloud Chamber” Kebuk awan / CC BY-SA 4.0 (cropped)
- Related lab (Minamino-Bronner Lab): “Groeeser.Hamamatsu.Photomultiplier” Bautsch / CC0 (cropped)
- Related lab (Katayose Lab): “Observatorio de Rayos Gamma HAWC 1” Marifer Veloz / CC BY-SA 4.0 (cropped)
- Related lab (Bamba Lab): “Cavity Optomechanics” Schmoele / CC BY-SA 3.0 (cropped)
- Related lab (Kosaka-Sekiguchi Lab): “Alice in BBN laboratory - DARPA Quantum Network, January 2003” Daderot / CC0 (cropped)
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