Pomeranchuk's theorem

Pomeranchuk's theorem 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.