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<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi><mml:mi>p</mml:mi><mml:mo>→</mml:mo><mml:mi>p</mml:mi><mml:mi>p</mml:mi><mml:msup><mml:mi>K</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>K</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math>reaction at high energies
We evaluate differential distributions for the four-body $pp\ensuremath{\rightarrow}pp{K}^{+}{K}^{\ensuremath{-}}$ reaction at high energies, which constitutes an irreducible background to three-body processes $pp\ensuremath{\rightarrow}ppM$, where $M=\ensuremath{\phi},{f}_{2}(1275),{f}_{0}(1500),{f}_{2}^{\ensuremath{'}}(1525),{\ensuremath{\chi}}_{c0}$. We consider the central diffractive contribution mediated by Pomeron and Reggeon exchanges as well as a completely new mechanism of emission of kaons from the proton lines. …