Pomeranchuk's theorem

Pomeranchuk's theorem states that difference of cross sections of interactions of elementary particles κ 1 + κ 2 and κ 1 + κ 2 ¯ (i. e. particle κ 1 with particle κ 2 , and with its antiparticle κ 2 ¯ ) approach 0 when s → ∞ , where s - energy in center of mass system.