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.
See also Pomeron
References N. N. Bogoliubov; A. A. Logunov; I. T. Todorov (1975). Introduction to Axiomatic Quantum Field Theory. Reading. Mass.: W. A. Benjamin, Advanced Book Program. ISBN 9780805309829. ISBN 0805309829.