An international team, including four Japanese researchers, has won the 2026 Breakthrough Prize in Fundamental Physics for precisely measuring the magnetic moment of muons, tiny subatomic particles.The announcement was made on Sunday. Among the Japanese award recipients is Akira Yamamoto, professor emeritus at the High Energy Accelerator Research Organization.Muons, which have been studied since the 1960s, are believed to be key to clarifying phenomena that cannot be explained by standard models of physics.