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Sub-threshold production of K$^{0}_{s}$ mesons and ${\Lambda}$ hyperons in Au+Au collisions at $\sqrt{s_{NN}}$ = 2.4 GeV

The collaboration
Phys.Lett.B 793 (2019) 457-463, 2019.

Abstract (data abstract)
HADES at GSI Analysis of the production of $K^{0}_{S}$ mesons and $\Lambda$ hyperons produced in fixed target Au+Au collisions at $\sqrt{s_{NN}} = 2.4 GeV$ below their free NN threshold energy. The corresponding paper "Sub-threshold production of $K^{0}_{S}$ mesons and $\Lambda$ hyperons in Au+Au collisions at $\sqrt{s_{NN}} = 2.4 GeV$" has been published under PLB 793 (2019) 457-463.

• #### Figure 1 Left Part - $K^{0}_{S}$ Mass Spectrum

Data from Page 3 Figure 1 Left Part of Publication

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Example of $K^{0}_{S}$ signal for 0-40% most central events, over mixed-event background for the bin $-0.05 < y_{cm} < 0.05$...

• #### Figure 1 Right Part - $\Lambda$ Mass Spectrum

Data from Page 3 Figure 1 Right Part of Publication

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Example of $\Lambda$ signal for 0-40% most central events, over mixed-event background for the bin $-0.05 < y_{cm} < 0.05$...

• #### Figure 2 Left Part - $K^{0}_{S}$ $m_{t}$ Spectra

Data from Page 3 Figure 2 Left Part of Publication

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Reduced transverse mass ($m_{t}-m_{0}$) spectra of $K^{0}_{S}$ for the 0-40% most central events. NOTE: The spectra are not scaled by...

• #### Figure 2 Right Part - $\Lambda$ $m_{t}$ Spectra

Data from Page 3 Figure 2 Right Part of Publication

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Reduced transverse mass ($m_{t}-m_{0}$) spectra of $\Lambda$ for the 0-40% most central events. NOTE: The spectra are not scaled by...

• #### Figure 3 Left Part - $K^{0}_{S}$ dN/dy Spectrum

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Rapidity distribution of $K^{0}_{S}$

• #### Figure 3 Right Part - $\Lambda$ dN/dy Spectrum

Data from Page 3 Figure 3 Right Part of Publication

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Rapidity distribution of $\Lambda$

• #### Figure 4 - Mid-Rapidity Yields

Data from Page 4 Figure 4 of Publication

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Compilation of mid-rapidity yields for central Au+Au collisions as a function of $\sqrt{s_{NN}}$ of $K^{0}_{S}$ and $\Lambda$.

• #### Figure 5 - Global $Mult/\langle A_{Part}\rangle$ Fit

Data from Page 4 Figure 5 of Publication

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Multiplicities per mean number of participants $Mult/\langle A_{Part}\rangle$ as a function of $\langle A_{Part}\rangle$

• #### Figure 6 Left Part - $K^{0}_{S}$ $Mult/\langle A_{Part}\rangle$

Data from Page 4 Figure 6 Left Part of Publication

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Multiplicities per mean number of participants $Mult/\langle A_{Part}\rangle$ as a function of $\langle A_{Part}\rangle$ for $K^{0}_{S}$

• #### Figure 6 Right Part - $\Lambda$ $Mult/\langle A_{Part}\rangle$

Data from Page 4 Figure 6 Right Part of Publication

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Multiplicities per mean number of participants $Mult/\langle A_{Part}\rangle$ as a function of $\langle A_{Part}\rangle$ for $\Lambda$

• #### Figure 7 Left Part - $K^{0}_{S}$ Comparison of dN/dy

Data from Page 5 Figure 7 Left Part of Publication

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Comparison of the shape of the rapidity distribution of $K^{0}_{S}$ to various transport model versions.

• #### Figure 7 Right Part - $\Lambda$ Comparison of dN/dy

Data from Page 5 Figure 7 Right Part of Publication

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Comparison of the shape of the rapidity distribution of $\Lambda$ to various transport model versions.

• #### Figure 8 Left Part - $K^{0}_{S}$ Comparison of $dN/dp_{t}$

Data from Page 5 Figure 8 Left Part of Publication

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Comparison of the shape of the $p_{t}$-spectra for $\pm0.15$ rapidity units around mid-rapidity of $K^{0}_{S}$ to various transport model versions.

• #### Figure 8 Right Part - $\Lambda$ Comparison of $dN/dp_{t}$

Data from Page 5 Figure 8 Right Part of Publication

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Comparison of the shape of the $p_{t}$-spectra for $\pm0.15$ rapidity units around mid-rapidity of $\Lambda$ to various transport model versions.

• #### Figure 9 - $K^{0}_{S}$ $m_{t}$ spectra for four centrality bins

Data from Page 6 Figure 9 of Publication

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Differential yield of $K^{0}_{S}$ as function of rapdidity and reduced transverse mass for the four centrality classes. NOTE: The spectra...

• #### Figure 10 - $\Lambda$ $m_{t}$ spectra for four centrality bins

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Differential yield of $\Lambda$ as function of rapdidity and reduced transverse mass for the four centrality classes. NOTE: The spectra...

• #### Table 1 - Multiplicities and effective Temperatures

Data from Page 4 Table 1 of Publication

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$K^{0}_{S}$ and $\Lambda$ multiplicities in full phase space and inverse slopes at mid-rapidity $T_{Eff}$ for a given centrality.

• #### Table 2 - $\alpha$ scaling parameter

Data from Page 4 Table 2 of Publication

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Value of the parameter $\alpha$ extracted for $K^{+}$, $K^{-}$, $K^{0}_{S}$, $\Lambda$ and $\Phi$, as displayed in Figure 5 - Global...

Version 2 modifications: Comment added w.r.t. normalization of Fig. 2