K-Meson Production and Isospin-Symmetry in pp and AA Collisions

The production of K-mesons in pp and AA collisions at high energies is analyzed. We show that the ratio RK = σ _K⁺ + σ _K⁻2σ _KS⁰ calculated within the similarity approach, including the gluon transverse momentum distribution at low QCD scales [5], and using the Lund model in the form of MC generator PYTHIA [14] is above 1 even at the conservation of the isospin-symmetry. It is about 1.18 at √ s = 11.9 GeV (the NA61/SHINE data [1]) and it decreases up to 1, when the energy increases up to a few TeV (ALICE data). The reason of this is related to the dynamics of the kaon production. This energy behavior of RK practically does not depend on the sort of beam or target.