Strange meson production in Al+Al collisions at 1.9A GeV
Abstract
The production of K+, K- and (1020) mesons is studied in Al+Al collisions at a beam energy of 1.9A GeV which is close or below the production threshold in NN reactions. Inverse slopes, anisotropy parameters, and total emission yields of K mesons are obtained. A comparison of the ratio of kinetic energy distributions of K- and K+ mesons to the HSD transport model calculations suggests that the inclusion of the in-medium modifications of kaon properties is necessary to reproduce the ratio. The inverse slope and total yield of φ mesons are deduced. The contribution to K- production from φ meson decays is found to be [17 3 (stat) +2-7 (syst)] %. The results are in line with previous K and φ data obtained for different colliding systems at similar incident beam energies.
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