Probing Strangeness Canonical Ensemble with $K^{-}$, $\phi(1020)$ and $\Xi^{-}$ Production in Au+Au Collisions at ${\sqrt{s_{NN}} = {3\,GeV}}$

The STAR collaboration
Phys.Lett.B 831 (2022) 137152, 2022.

Abstract (data abstract)
BNL-RHIC. We report on the first multi-differential measurement of $\phi$ meson and $\Xi^{-}$ hyperon production as well as the $\phi/K^-$ and $\phi/\Xi^-$ ratio in Au+Au collisions at ${\sqrt{s_{\mathrm{NN}}} = \mathrm{3\,GeV}}$ with the STAR experiment under its fixed target configuration at RHIC. $\phi$ mesons and $\Xi^{-}$ hyperons are measured through their hadronic decay channels, $\phi\rightarrow K^+K^-$ and $\Xi^-\rightarrow \Lambda\pi^-$. The transverse kinetic energy spectra of $K^-$, $\phi$ and $\Xi^{-}$ are presented in different centrality and rapidity intervals. The total production yields and the ratios within a $4\pi$ coverage are calculated and compared to thermal model predictions. The calculation within grand canonical ensemble framework shows a clear discrepancy from our measurement. Our data favors the canonical ensemble approach employing local strangeness conservation with a small strangeness correlation length ($r_c \leq 4.2$\,fm) in $\mathrm{0--10\%}$ central Au+Au collisions at ${\sqrt{s_{\mathrm{NN}}} = \mathrm{3\,GeV}}$.

  • Data from Figure 2(a)1

    Data from Figure 2a for $K^-$

    10.17182/hepdata.110657.v1/t1

    $K^-$ (a), invariant yields as a function of $m_T-m_0$ for various rapidity regions in 0--10\% central Au+Au collisions at ${\sqrt{s_{\mathrm{NN}}}...

  • Data from Figure 2(a)2

    Data from Figure 2a for $\phi$

    10.17182/hepdata.110657.v1/t2

    $\phi$ meson (b) invariant yields as a function of $m_T-m_0$ for various rapidity regions in 0--10\% central Au+Au collisions at...

  • Data from Figure 2(a)3

    Data from Figure 2a for $\Xi^-$

    10.17182/hepdata.110657.v1/t3

    $\Xi^-$ (c) invariant yields as a function of $m_T-m_0$ for various rapidity regions in 0--10\% central Au+Au collisions at ${\sqrt{s_{\mathrm{NN}}}...

  • Data from Figure 2(b)1

    Data from Figure 2b for $K^-$

    10.17182/hepdata.110657.v1/t4

    $K^-$ (a), invariant yields as a function of $m_T-m_0$ for various rapidity regions in 10--40\% central Au+Au collisions at ${\sqrt{s_{\mathrm{NN}}}...

  • Data from Figure 2(b)2

    Data from Figure 2b for $\phi$

    10.17182/hepdata.110657.v1/t5

    $\phi$ meson (b) invariant yields as a function of $m_T-m_0$ for various rapidity regions in 10--40\% central Au+Au collisions at...

  • Data from Figure 2(b)3

    Data from Figure 2b for $\Xi^-$

    10.17182/hepdata.110657.v1/t6

    $\Xi^-$ (c) invariant yields as a function of $m_T-m_0$ for various rapidity regions in 10--40\% central Au+Au collisions at ${\sqrt{s_{\mathrm{NN}}}...

  • Data from Figure 2(c)1

    Data from Figure 2c for $K^-$

    10.17182/hepdata.110657.v1/t7

    $K^-$ (a), invariant yields as a function of $m_T-m_0$ for various rapidity regions in 40--60\% central Au+Au collisions at ${\sqrt{s_{\mathrm{NN}}}...

  • Data from Figure 2(c)2

    Data from Figure 2c for $\phi$

    10.17182/hepdata.110657.v1/t8

    $\phi$ meson (b) invariant yields as a function of $m_T-m_0$ for various rapidity regions in 40--60\% central Au+Au collisions at...

  • Data from Figure 3(a)

    Data from Figure 3 for $K^-$

    10.17182/hepdata.110657.v1/t9

    Rapidity density distributions of $K^-$ (squares), $p_T$-integrated yields $dN/dy$ in 0--10\% (a), 10--40\% (b) and 40--60\% central (c) Au+Au collisions...

  • Data from Figure 3(b)

    Data from Figure 3 for $\phi$

    10.17182/hepdata.110657.v1/t10

    Rapidity density distributions of $\phi$ meson (circles) $p_T$-integrated yields $dN/dy$ in 0--10\% (a), 10--40\% (b) and 40--60\% central (c) Au+Au...

  • Data from Figure 3(c)

    Data from Figure 3 for $\Xi^-$

    10.17182/hepdata.110657.v1/t11

    Rapidity density distributions of $\Xi^-$ (diamonds) $p_T$-integrated yields $dN/dy$ in 0--10\% (a), 10--40\% (b) and 40--60\% central (c) Au+Au collisions...

  • Data from Figure 4

    Data from Figure for $\phi/K^-$ and $\phi/\Xi^-$

    10.17182/hepdata.110657.v1/t12

    $\phi/K^-$ (a) and $\phi/\Xi^-$ (b) ratio as a function of collision energy, $\sqrt{s_{\mathrm{NN}}}$. The solid black circles show the measurements...

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