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Tomochika Arai
Physics PhD student at the University of Tokyo; silver medalist for Japan at the 2018 International Mathematical Olympiad
The University of Tokyo · 
Tokyo, Japan · academic
Tokyo, Japan · academicSilver Medal For Japan At The 2018 International Mathematical Olympiad (28 Points, Rank 87)PhD Student (D2 As Of April 2026) In The Yokoyama-Nakajima Group, Dept. Of Physics, University Of TokyoContributor To The T2K Experiment's Super-FGD Detector UpgradePresented 'Latest Results From FASER At The LHC' At PASCOS 2024
Tomochika Arai is a physics PhD student in the Yokoyama-Nakajima Group, Department of Physics, University of Tokyo, where he works on the T2K neutrino oscillation experiment's Super-FGD detector and presents results for the FASER experiment at the LHC. Before university he represented Japan at the 2018 International Mathematical Olympiad in Romania, earning a silver medal with 28 points (rank 87).
Details
high-energy physicsneutrino physicsT2K experimentSuper-FGD detectorFASERmathematicsparticle physics
Notes
- Won a silver medal for Japan at IMO 2018 with 28 points (perfect 7s on problems 1, 2, 4 and 5; zero on 3 and 6), placing 87th overall - an elite contest-math background that he parlayed into experimental particle physics rather than a pure-math or software career.Jul 2018
- Listed as a D2 (second-year doctoral) student as of April 2026 in the University of Tokyo Yokoyama-Nakajima Group, working on the T2K experiment - roughly an 8-year arc from IMO silver to second-year PhD in neutrino physics.Apr 2026
- Public contact is the departmental address [contact omitted] (lab member page lists 'arai' under @hep.phys.s.u-tokyo.ac.jp).Apr 2026
- Presented 'Latest Results from FASER at the LHC' at the 29th International Symposium on Particles, Strings and Cosmology (PASCOS 2024), July 2024 in Quy Nhon, Vietnam - showing he speaks for an LHC experiment, not only T2K.Jul 2024
- Member of the T2K collaboration, contributing to the Super-FGD (Super Fine-Grained Detector) upgrade for the off-axis near detector.2026
- Co-authored 'Online Monitor and Data Quality Checks of the Super-FGD for the T2K Off-Axis Near Detector' in JPS Conf. Proc. 45, 011196 (2026), proceedings of the 4th J-PARC Symposium 2024.2026
- Came to physics via the T2K/FASER/U-Tokyo high-energy neutrino group; a Japanese search for the 2018 Japan IMO team surfaces him with the U-Tokyo group, but no personal site, GitHub, X, or blog is indexed, suggesting a low public-web footprint outside academic pages.Apr 2026
- Has an ACM Digital Library author profile affiliated with The University of Tokyo (1 publication, 2023, 7 citations) - but ACM is a computer-science venue, so this may conflate him with a CS namesake; treat as ambiguous.2023
Experience
PhD Student (D2), Department of Physics at The University of Tokyo
Contributor, Super-FGD / T2K collaboration at The University of Tokyo
PhD Student (D2) at The University of Tokyo
Education
The University of Tokyo
PhD (in progress), Physics
The University of Tokyo
Master's, Physics
AchievementsSilver medal, International Mathematical Olympiad 2018 (Japan team), rank 87, 28 points (7-7-0-7-7-0)
AwardsSilver Medal, International Mathematical Olympiad 2018
Competition record
Japan · IMO