Biographical Memoirs Volume 80 (2001) / Chapter Skim
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Sam Bard Treiman
Sam Bard Treiman
Pages 328-347
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Shortly afterwards Treiman embarkocl with Marvin GoIciberger on a dispersion relations analysis ~ ~ 958 ) of plan en cl nucleon beta clecay, a 329
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Weinberg is a Nobel laureate for his contributions to electroweak unification. Treiman's students, building on his basic philosophy, contributed much to the current edifice of the Standard Model.
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PERSONAL HISTORY Sam Treiman was born in Chicago to a first-generation immigrant family. His father, Abraham, hacl come to the Uniter!
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was an important factor in his effectiveness in debate en cl counsel: Sam's ability to see wry humor in the face of serious issues lightenecl many a clifficult moment, gave warmth to all of us, en c! was something he took great pleasure in sharing." In a second autobiographical piece, a beautiful, cletailecl account of his career in particle physics written for Annual Review of Nuclear and Particle Science ~ ~ 996)
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by an Atomic Energy Commission precloctoral fellowship, wrote his cloctoral thesis on cosmic ray physics uncler the supervision of John Simpson, receiving his Ph.D.
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In both capacities he was a major voice in shaping the future of the university en cl its · ~ science pot .lCy. Following naturally on his thesis in cosmic ray physics, Treiman associated himself with the cosmic ray group in Princeton, which hac!
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After the parity revolution of 1957, in which it was cliscoverec! that the weak interactions clo not respect left-right reflection symmetry, Treiman with Jackson en cl Wy~cl re-analyzecl nucleon beta clecay (1957)
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but only halfunclerstoocl iclea into one with a firm conceptual base on which a project could be built. Khuri's thesis topic was part of a larger Princeton effort in dispersion relations, which was spurred by the presence
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Using the plan off-shell mass as the variable to be analytically continual into the complex plane en cl making some astute approximations, they cleclucecl a simple formula relating the charger! plan clecay amplitucle f,, to the nucleon mass m, the pion-nucleon coupling constant g, en cl the weak axial vector coupling parameter measured in beta clecay gA, off= mgA.
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From page 338... ...
In moclern terms an exactly conserved axial vector current, together with the fact that the nucleon is massive en c! has no opposite parity partner, implies that chiral symmetry is spontaneously broken by the strong interactions, with the appearance of massless pions as the corresponcling Goicistone bosons.
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From page 339... ...
Before long, Sam was able to say "now there is a second number," en cl after my derivation of a sum rule relating the axial vector coupling constant to plan nucleon scattering cross sections (also derived independently by William Weisberger) , which Sam was one of the first to learn about, this number blossomecl into a multitucle.
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Treiman was also active on more theoretical issues as well. Following the theoretical work of James Bjorken on scaling en cl its experimental discovery at the Stanford Linear Accelerator Center, Gell-Mann proposal the dictum that "nature reads the free-field theory books." Using the connection between the Bjorken scaling limit for the electroprocluction inclusive cross section en cl the commutator of electromagnetic currents near the light cone, Treiman en c!
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One of the great events in physics in the micI-sixties was the 1964 discovery by Treiman's Princeton colleagues Val Fitch, lames Cronin, lames Christenson, en cl Rene TurIay of the failure of CP (charge conjugation times parity) symmetry in K meson decays.
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It was later vastly enlarged and transmuted into his highly acclaimed scientific biography of Einstein, Subtle is the Lord. Subsequently, he published Inward Bound, the originally conceived though greatly broadened history of particle physics in the twentieth century.
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. Altogether, over the period of a decade, the CUSPEA program brought close to a thousand mainland Chinese students to America and fostered Chinese-US physics contacts on a broader front.
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I have also benefited in preparing this narrative from my personal association with Sam and with many of his collaborators, first as his graduate student at Princeton from 1961 to 1964 and later as a colleague at the nearby Institute for Advanced Study from 1966 onwards. I wish to thank Joan Treiman for supplying family information and to thank Sarah Brett-Smith, Curtis Callan, Val Fitch, and loan Treiman for reading a draft of this memoir.
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Wyld, Jr. Possible tests of time reversal invariance in beta decay.
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Light-cone structure of current commutators in gluonquark model.
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