Pomeranchuk theorem[¦päm·ə¦rän·chək ‚thir·əm]
in quantum field theory, a theorem asserting that the total effective interaction cross section of a particle and antiparticle with the same target tend toward the same limit as the collision energy increases. The Pomeranchuk theorem was formulated by I. Ia. Pomeranchuk in 1958 on the basis of the general postulates of quantum field theory and the assumption that the process of the scattering of strongly interacting particles, or hadrons, is diffractive in character with a constant radius of interaction. A. A. Logunov generalized the Pomeranchuk theorem for differential cross sections and analyzed the conditions of its applicability for radii of interaction that increase with energy.