Murray Gell-Mann is an American physicist and linguist who received the 1969 Nobel Prize in physics for his work on the theory of elementary particles and discovery of the quark. He is the Robert Andrews Millikan Professor of Theoretical Physics Emeritus at Caltech, a Distinguished Fellow and co-founder of the Santa Fe Institute, Professor in the Physics and Astronomy Department of the University of New Mexico, and the Presidential Professor of Physics and Medicine at the University of Southern California. He formulated the quark model of hadronic resonances, and identified the SU flavor... symmetry of the light quarks, extending isospin to include strangeness, which he also discovered. He developed the V-A theory of the weak interaction in collaboration with Richard Feynman. He created current algebra in the 1960s as a way of extracting predictions from quark models when the fundamental theory was still murky, which led to model-independent sum rules confirmed by experiment. Gell-Mann, along with Maurice Lévy, developed the sigma model of pions, which describes low energy pion interactions.
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