Strange meson production in Al+Al collisions at 1.9A GeV

Abstract

The production of K${}^{+}$, K${}^{-}$ and $\phi$(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 $\varphi$ mesons are deduced. The contribution to K${}^{-}$ production from $\varphi$ meson decays is found to be [17 $\pm$ 3 (stat) ${}_{-7}^{+2}$ (syst)] %. The results are in line with previous K${}^{\pm }$ and $\varphi$ data obtained for different colliding systems at similar incident beam energies.

16 pages, 11 figures

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• Kaon Pair Production in Proton--Proton Collisions
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Cited by in corpus (7)

• Meson-nucleus potentials and the search for meson-nucleus bound states
• Deep sub-threshold ϕ production and implications for the K+/K- freeze-out in Au+Au collisions
• Probing Strangeness Canonical Ensemble with $K^{-}$, $\varphi (1020)$ and ${\Xi }^{-}$ Production in Au+Au Collisions at $\sqrt{s_{\mathrm{NN}}}=3\mathrm{GeV}$
• Wide acceptance measurement of the K${}^{-}$/K${}^{+}$ ratio from Ni+Ni collisions at 1.91A GeV
• Centrality dependence of subthreshold $\varphi$ meson production in Ni+Ni collisions at 1.9A GeV
• Systematics of yields of strange hadrons from heavy-ion collisions around threshold energies
• Kaon production in the HADES experiment in Au+Au collisions at $\sqrt{s_{\mathrm{NN}}}=2.4$ GeV