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Tōichirō Kinoshita (木下東一郎, Kinoshita Tōichirō ; b. 23 January 1925 in Tokyo) is a Japanese-American theoretical physicist. Kinoshita studied physics at the University of Tokyo, where he in 1947 earned his baccalaureate degree and in 1952 attained a doctorate. Afterwards he spent two years as a postdoc at the Institute of Advanced Study and in 1954 at Columbia University. Starting from 1954 he was at Cornell University, 1955 as assistant professor, 1958 as associate professor and starting from 1960 as a full professor (starting from 1992 as Goldwin Smith professor) at Newman Laboratory of Nuclear Studies of Cornell University. In 1962-63 he was a Ford Fellow at CERN. In 1995 he retired from Cornell as professor emeritus. He was a guest professor at the University of Tokyo, at CERN, and at the national laboratory for high-energy physics KEK in Japan.
Kinoshita is known for his extensive precision computations of fundamental quantities in quantum electrodynamics. The fundamental quantities involved electroweak theory and corrections related to the Standard Model, such as the anomalous magnetic moments of both the electron and the muon and the spectra of positronium and muonium, which made possible far more exact comparisons between theory and experiment. In 1962 he introduced the Kinoshita-Lee-Nauenberg theorem. In the 1970s he worked on quantum chromodynamics and quarkonium - spectroscopy with Estia Eichten, Kenneth Lane, Kurt Gottfried.
In 2001 Kinoshita had to admit there was an error in his computation of the anomalous magnetic moment of the muon, after experiments at Brookhaven discovered a discrepancy in the 9th to-right-of-the-decimal-point position — leading many to believe that experimental evidence had revealed "new physics". However, a group in Marseille examined Kinoshita's calculation in precise detail and found that the error resulted from a sign error within the computer algebra program used for the original calculation. When the software bug was fixed, the discrepancy was resolved.
- Kinoshita as editor and co-author, Quantum Electrodynamics. World Scientific 1990
- Rebhan, 2001 (German)