With Murray Gell-Mann, Feynman developed a model of weak decay, which showed that the current coupling in the process is a combination of vector and axial currents (an example of weak decay is the decay of a neutron into an electron, a proton, and an antineutrino). Although E. C. George Sudarshan and Robert Marshak developed the theory nearly simultaneously, Feynman's collaboration with Gell-Mann was seen as seminal because the weak interaction was neatly described by the vector and axial currents. It thus combined the 1933 beta decay theory of Enrico Fermi with an explanation of parity violation.
With Murray Gell-Mann, Feynman developed a model of weak dec.ay, which showed that the current coupling in the process is a combination of vector and axial currents (an example of w.eak decay is the decay of a neutron into an electron, a proton, and an antineutrino) Although E. C. George Sudarshan and Robert Marshak developed the theory nearly simultaneously, Feynman's collaboration with Gell-Mann was seen as seminal because the weak interaction was neatly described by the vector and axial currents It thus combined the 1933 beta decay theory of Enrico Fermi with an explanation of parity violation.