"Use of Causality Conditions in Quantum Theory", in Physical Review

GELL-MANN, M. and M.L. Goldhaber and W.E. Thirring, "Use of Causality Conditions in Quantum Theory", in Physical Review, volume 95, number 6, 15 September 1954, pp 1612-1627 in the issue of pp 1365-1753.Very good copy in original wrappers. Abstract: "The limitations on scattering amplitudes imposed by causality requirements are deduced from the demand that the commutator of field operators vanish if the operators are taken at points with space-like separations. The problems of the scattering of spin-zero particles by a force center and the scattering of photons by a quantized matter field are discussed. The causality requirements lead in a natural way to the well-known dispersion relation of Kramers and Kronig. A new sum rule for the nuclear photoeffect is derived and the scattering of photons by nucleons is discussed."--Smithsonian/NASA Astrophysics Data.