Sub-threshold $\varphi$ and ${\Xi }^{-}$ production by high mass resonances with UrQMD

Abstract

We present a possible explanation for the deep sub-threshold, $\varphi$ and ${\Xi }^{-}$ production yields measured with the HADES experiment in Ar+KCl reactions at $E_{\mathrm{lab}}=1.76$ A GeV and present predictions for Au+Au reactions at $E_{\mathrm{lab}}=1.23$ A GeV. To explain the surprisingly high yields of $\varphi$ and ${\Xi }^{-}$ hadrons we propose new decay channels for high mass baryon resonances. These new decay channels are constrained by elementary $\mathrm{p}+\mathrm{p}\to \mathrm{p}+\mathrm{p}+\varphi$ cross sections, and ${\Xi }^{-}$ production in p+Nb. Based on the fits to the elementary reactions one obtains a satisfactorily description of $\varphi$ and ${\Xi }^{-}$ production in deep sub-threshold Ar+KCl reactions as well as the observed nuclear transparency ratio in proton induced $\varphi$ production in cold nuclear matter. The results implicate that no new medium effects are required to describe the rare strange particle production data in low energy nuclear collisions.

9 pages, 9 figures Version accepted for publication by JPG

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