Towards model descriptions of the latest data by the NA61/SHINE collaboration on ${^{40}\mathrm{Ar}+{^{45}}\mathrm{Sc}}$ and ${^{7}\mathrm{Be}+{^{9}}\mathrm{Be}}$ interactions

Application of the HIJING, EPOS 1.99, UrQMD and Geant4 FTF models for the analysis of experimental data by the collaboration is considered. A short description of the models is given. It is shown that the FTF (FRITIOF) model of the Geant4 toolkit describes well the NA61/SHINE data on $\pi ^-$ meson rapidity distributions in ${ ^{40}\mathrm{Ar}+{}^{45}\mathrm{Sc}}$ interactions at $\sqrt{s_{NN}}=$ 5.2 and 6.1 GeV. At higher energies, $\sqrt{s_{NN}}=$7.6, 8.8, 11.9 and 16.8 GeV, the model underestimates the data by 13%, 14%, 14% and 27%, respectively. The model also describes well the analogous data for ${^{7}\mathrm{Be}+{}^{9}\mathrm{Be}}$ interactions at all energies ($\sqrt{s_{NN}}=$ 6.1–16.8 GeV). It is the best model description among the descriptions of other models considered by the collaboration.