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Ushiroda Lab (Interdisciplinary Science Unit, The University of Tokyo / KEK Belle Group)
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The lab precisely measures B meson decays to search for physics beyond the Standard Model.
AboutAbout the lab
The world beyond particle collisions
The Ushiroda Lab is an experimental particle physics lab working on the Belle II experiment.
The lab is based at the High Energy Accelerator Research Organization (KEK) in Tsukuba, Ibaraki, the host institution of the Belle and Belle II experiments.
In collaboration with the B-Factory lab at the Graduate University for Advanced Studies (SOKENDAI), the lab carefully analyzes data on B meson and anti-B meson pairs and tau lepton pairs produced in large numbers by the SuperKEKB accelerator.
The lab studies CP violation and lepton flavor violation to search for new physical phenomena beyond the Standard Model.
Key terms
- B meson
- A heavy, short-lived particle containing a bottom quark. Large numbers of them can be produced in accelerator collisions.
- CP violation
- A slight difference in behavior between particles and antiparticles.
- Standard Model
- The current fundamental theory that describes elementary particles and the behavior of the forces acting between them.
ResearchResearch themes
The lab uses the Belle II detector to precisely measure particles produced in electron-positron collisions at the SuperKEKB accelerator. By carefully analyzing data such as B meson and anti-B meson pairs and tau lepton pairs, the lab searches for new physical phenomena beyond the Standard Model.
*Illustrative imageCP Violation
The lab analyzes data on B meson and anti-B meson pairs produced in large numbers by the SuperKEKB accelerator to study CP violation, in which particles and antiparticles behave differently.
*Illustrative imageLepton Flavor Violation
By precisely measuring how particles such as the tau lepton decay, the lab searches for phenomena in which one type of lepton changes into another. If observed, such phenomena would offer clues to new physics beyond the Standard Model.
*Illustrative imageDetector and Accelerator Research
To improve data quality, the lab pursues broad research that goes beyond the Belle II detector into the boundary area with the accelerator, a position made possible by being at the host institution.
MembersFaculty
The members of the Ushiroda Lab consist of faculty, postdoctoral researchers, and doctoral and master's students.As of 2026
- ProfessorYutaka Ushiroda
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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: “SuperKEKB accelerator and Belle II detector, near the collision point” 高エネルギー加速器研究機構 / © KEK
- CP Violation: “SuperKEKB (1)” Kestrel / CC BY-SA 4.0 (cropped)
- Lepton Flavor Violation: “Linac straight for 600m” yellow_bird_woodstock / CC BY-SA 2.0 (cropped)
- Detector and Accelerator Research: “Belle II detector half closed” Peacearth / CC BY-SA 4.0 (cropped)
- Related lab (Fundamental Symmetry Lab): “Cold atoms experiment 04” Tomasz Kawalec / 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 (Michimura Lab): “In-construction KAGRA gravitational-wave detector” Christopher Berry / CC BY-SA 4.0 (cropped)
- Related lab (Suehara Lab): “International Linear Collider main linac cryomodule - exterior” Kane Farabaugh, VOA News / Public domain (cropped)
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