SAM BARD TREIMAN

May 27, 1925–November 30, 1999

BY STEPHEN L.ADLER

SAM BARD TREIMAN WAS a major force in particle physics during the formative period of the current Standard Model, both through his own research and through the training of graduate students. Starting initially in cosmic ray physics, Treiman soon shifted his interests to the new particles being discovered in cosmic ray experiments. He evolved a research style of working closely with experimentalists, and many of his papers are exemplars of particle phenomenology. By the mid-1950s Treiman had acquired a lifelong interest in the weak interactions. He would preach to his students that “the place to learn about the strong interactions is through the weak and electromagnetic interactions; the problem is half as complicated.” The history of the subsequent development of the Standard Model showed this philosophy to be prophetic.

After the discovery of parity violation in weak interactions, Treiman in collaboration with J.David Jackson and Henry Wyld (1957) worked out the definitive formula for allowed beta decays, taking into account the possible violation of time reversal symmetry, as well as parity. Shortly afterwards Treiman embarked with Marvin Goldberger on a dispersion relations analysis (1958) of pion and nucleon beta decay, a



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