Strange Hadron Production at High Baryon Density

Strange hadrons have been suggested as sensitive probes of the properties of the nuclear matter created in heavy-ion collisions. At few-GeV collision energies, the formed medium is baryon-rich due to baryon stopping effect. In these proceedings, the recent results on strange hadron production in Au+Au collisions at $\sqrt{s_{\mathrm{N}\mathrm{N}}}$ = 3.2, 3.5, 3.9 and 4.5 GeV with the fixed-target mode from the STAR Beam Energy Scan phase-II program are presented. The transverse momentum spectra, rapidity density distributions, excitation function and centrality dependence of strange hadrons (${\mathrm{K}}_S^0,\mathrm{\Lambda },{\mathrm{\Xi }}^{-}$) are shown. These results are compared with those from higher collision energies and physics implications are discussed by comparing to the transport model calculations.