Val Logsdon Fitch (born March 10, 1923) is an American nuclear physicist. A native of Nebraska, he graduated from McGill University with a bachelor's degree in electrical engineering in 1948 and was awarded a Ph.D. in physics by Columbia University in 1954.

Fitch and co-researcher James Watson Cronin were awarded the 1980 Nobel Prize in Physics for a 1964 experiment that proved that certain subatomic reactions do not adhere to fundamental symmetry principles. Specifically, they proved, by examining the decay of K-mesons, that a reaction run in reverse does not merely retrace the path of the original reaction, which showed that the reactions of subatomic particles are not indifferent to time. Thus the phenomenon of CP violation was discovered.
Prof. Fitch is a member of the Board of Sponsors of The Bulletin of the Atomic Scientists[1].

Links

• Val Logsdon Fitch
  
• the discovery of violations of fundamental symmetry principles in the decay of neutral K-mesons.