Abstract
Antikaon production in nucleus-nucleus collisions at energies below the threshold for its production from the nucleon-nucleon interaction in free space is studied in the relativistic transport model. We include the in-medium self-energies of kaon and antikaon determined from either the mean-field approximation to the chiral Lagrangian or the empirical effective scattering lengths for the kaon-nucleon and the antikaon-nucleon interaction. Also, the final-state interactions of antikaons with nucleons through both elastic scattering and absorption are explicitly treated in the study. Our results indicate that an attractive scalar potential for kaon and antikaon is needed to explain quantitatively the experimental data from the Ni+Ni collision at 1.85 GeV/nucleon. To see more clearly the effect of the attractive scalar potential, we suggest that experiments at lower incident energies be carried out.
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