Abstract
K+ meson productions in nucleus-nucleus collisions at energies near the kaon production threshold energy were investigated within the quantum molecular dynamics (QMD) model based on the covariant kaon dynamics. We analyzed the rapidity dependence of the direct flow v1 and the elliptic flow v2 of K+ meson, and the transverse momentum (pT) dependence of v1 for the K+ meson in Ni + Ni collisions at 1.91 AGeV, and compared the results with the FOPI data. We observed that the kaon in-medium potential obviously affects the K+ production in nucleus-nucleus collisions. After taking into account the K+ in-medium potential and using the soft equation of state, the theoretical results are in good agreement with the experimental data.
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