Pomeranchuk's theorem
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Pomeranchuk's theorem, named after Soviet physicist Isaak Pomeranchuk, states that difference of cross sections of interactions of elementary particles κ 1 + κ 2 {\displaystyle \kappa _{1}+\kappa _{2}} and κ 1 + κ 2 ¯ {\displaystyle \kappa _{1}+{\bar {\kappa _{2}}}} (i. e. particle κ 1 {\displaystyle {\kappa _{1}}} with particle κ 2 {\displaystyle \kappa _{2}}, and with its antiparticle κ 2 ¯ {\displaystyle {\bar {\kappa _{2}}}}) approach 0 when s → ∞ {\displaystyle s\to \infty }, where s {\displaystyle s} is the energy in center of mass system.