Pomeranchuk's theorem

Pomeranchuk's theorem, named after Soviet physicist Isaak Pomeranchuk, states that difference of cross sections of interactions of elementary particles $$\kappa_1+\kappa_2$$ and $$\kappa_1+\bar{\kappa_2}$$ (i. e. particle $${\kappa_1}$$ with particle $$\kappa_2$$, and with its antiparticle $$\bar{\kappa_2}$$) approach 0 when $$s \to \infty$$, where $$s$$ is the energy in center of mass system.