Strange meson production in Al+Al collisions at 1.9A GeV
arXiv:1512.06988 · doi:10.1140/epja/i2016-16177-y
Abstract
The production of K$^+$, K$^-$ and $Ï$(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$^{\pm}$ 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 $Ï$ mesons are deduced. The contribution to K$^-$ production from $Ï$ meson decays is found to be [17 $\pm$ 3 (stat) $^{+2}_{-7}$ (syst)] %. The results are in line with previous K$^{\pm}$ and $Ï$ data obtained for different colliding systems at similar incident beam energies.
16 pages, 11 figures