Val Logsdon Fitch (1923-2022) was an American physicist best known for his groundbreaking work in the field of particle physics, particularly in the study of the violation of parity symmetry. In 1956, he and his collaborator, James Cronin, conducted experiments that demonstrated that certain weak interactions do not conserve parity, which was a significant finding in the understanding of fundamental forces in physics.
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An experimental particle physicist who coauthored the 1964 observation of CP violation in neutral kaon decay. The experiment sought two-pion decays in the long-lived neutral beam, reconstructing their kinematics with magnetic spectrometers. The signal tested a symmetry of the weak interaction through a rare process rather than a bulk property of matter.[ref]
Evidence for the 2π Decay of the K₂⁰ Meson by James H. Christenson and others. Apparatus and rare two-pion decay result