Speaker
Description
Recently, the NA61/SHINE collaboration published experimental data on the production of $\pi^\pm$ and $K^\pm$ mesons in central ${\rm ^{40}Ar+{}^{45}Sc}$ interactions at variouse energies. The collaboration compared its results with calculations of the theoretical Monte Carlo models -- EPOS 1.99, PHSD 4.1 and SMASH 2.1.4. It turned out that none of these models reproduces the data in full. All models significantly underestimate the yields of $K^+$ and $K^-$ mesons by a factor of $\sim$ 2. In this paper, an attempt is made to describe the yields of $K^+$ and $K^-$ mesons within the framework of the quark-gluon string model implemented in the DCM program -- Dubna Cascade Model. According to this model, strings formed between the "sea" quarks and antiquarks of colliding nucleons should be dominated in central nucleus-nucleus interactions . To achieve an agreement with the experimental data, it is necessary to assume that strange quarks and antiquarks dominate among the "sea" quarks and antiquarks. The probability of finding a pair of strange quark -- strange antiquark is 72 \%! This value seems unrealistic. It may be related to an incorrect implementation of the quark-gluon string model in the DCM. It is of interest to obtain the corresponding predictions of the modern EPOS and QGSJET models.
