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Susumu Okubo is a Japanese theoretical physicist at the University of Rochester.
ÅŒkubo began study at the University of Tokyo in 1949 and received his bachelor's degree there in 1952. He became a graduate student at the University of Rochester in 1954, where he earned his PhD in 1958 with Robert Marshak as thesis advisor. Afterwards, he was a postdoc in 1959/60 at the University of Naples, in 1960/61 at CERN, after that for a short time in Japan because he had a problem obtaining a US visa, and then in 1962 again at the University of Rochester, where he became a professor in 1964 and retired in 1996 as an emeritus professor. ÅŒkubo works primarily on elementary particle physics. He is famous for the Gell-Mann-Okubo mass formula for mesons and baryons in the quark model; this formula correctly predicts the relations of masses of the members of SU multiplets in terms of hypercharge and isotopic spin.
In 2005 he received the Sakurai Prize from the American Physical Society for "For groundbreaking investigations into the pattern of hadronic masses and decay rates, which provided essential clues into the development of the quark model, and for demonstrating that CP violation permits partial decay rate asymmetries".
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