Table 2 The compilation of world data on charged and neutral kaon yields in nucleus-nucleus collisions

NA61/SHINE experiment
Ar+Sc collisions at \(\sqrt{{s}_{NN}}=\) 11.9 GeV
hadron	Yields (y ≈ 0) ± σ_stat ± σ_sys	σ_total	Centrality	y ranges	Ref.
K⁺	3.732 ± 0.016 ± 0.148	0.15	0–10%	0.0 < y < 0.2	¹⁸
K⁻	2.029 ± 0.012 ± 0.069	0.070	0–10%	0.0 < y < 0.2	¹⁸
\({K}_{S}^{0}\)	2.433 ± 0.027 ± 0.102	0.11	0–10%	y = 0	this analysis

HADES experiment
Ar+KCl collisions at \(\sqrt{{s}_{NN}}=\) 2.6 GeV
hadron	Yields (4π) ± σ_stat± σ_sys	σ_total	Centrality	y ranges	Ref.
K⁺	0.028 ± 0.002 ± 0.0014 ^(*)	0.0024	0–35%	extrapolated to 4π	⁴³
K⁻	0.00071 ± 0.00015 ± 0.000032 ^(*)	0.00015	0–35%	extrapolated to 4π	⁴³
\({K}_{S}^{0}\)	0.0115 ± 0.0005 ± 0.0009	0.0010	0–35%	extrapolated to 4π	⁴⁴

STAR (BES I) experiment
Au+Au collisions at \(\sqrt{{s}_{NN}}=\) 7.7 GeV
hadron	Yields (y ≈ 0) ± σ_stat ± σ_sys	σ_total	Centrality	y ranges	Ref.
K⁺	20.8	1.7	0–5%	−0.1 < y < 0.1	³⁰
K⁻	7.7	0.6	0–5%	−0.1 < y < 0.1	³⁰
\({K}_{S}^{0}\)	12.67 ± 0.12 ± 0.44	0.46	0–5%	−0.5 < y < 0.5	³¹

STAR (BES I) experiment
Au+Au collisions at \(\sqrt{{s}_{NN}}=\) 11.5 GeV
hadron	Yields (y ≈ 0) ± σ_stat ± σ_sys	σ_total	Centrality	y ranges	Ref.
K⁺	25.0	2.5	0–5%	−0.1 < y < 0.1	³⁰
K⁻	12.3	1.2	0–5%	−0.1 < y < 0.1	³⁰
\({K}_{S}^{0}\)	15.93 ± 0.12 ± 0.58	0.59	0–5%	−0.5 < y < 0.5	³¹

STAR (BES I) experiment
Au+Au collisions at \(\sqrt{{s}_{NN}}=\) 19.6 GeV
hadron	Yields (y ≈ 0) ± σ_stat ± σ_sys	σ_total	Centrality	y ranges	Ref.
K⁺	29.6	2.9	0–5%	−0.1 < y < 0.1	³⁰
K⁻	18.8	1.9	0–5%	−0.1 < y < 0.1	³⁰
\({K}_{S}^{0}\)	20.89 ± 0.08 ± 0.67	0.67	0–5%	−0.5 < y < 0.5	³¹

STAR (BES I) experiment
Au+Au collisions at \(\sqrt{{s}_{NN}}=\) 27 GeV
hadron	Yields (y ≈ 0) ± σ_stat ± σ_sys	σ_total	Centrality	y ranges	Ref.
K⁺	31.1	2.8	0–5%	−0.1 < y < 0.1	³⁰
K⁻	22.6	2.0	0–5%	−0.1 < y < 0.1	³⁰
\({K}_{S}^{0}\)	23.24 ± 0.09 ± 0.70	0.71	0–5%	−0.5 < y < 0.5	³¹

STAR (BES I) experiment
Au+Au collisions at \(\sqrt{{s}_{NN}}=\) 39 GeV
hadron	Yields (y ≈ 0) ± σ_stat ± σ_sys	σ_total	Centrality	y ranges	Ref.
K⁺	32.0	2.9	0–5%	−0.1 < y < 0.1	³⁰
K⁻	25.0	2.3	0–5%	−0.1 < y < 0.1	³⁰
\({K}_{S}^{0}\)	24.9 ± 0.1 ± 1.7	1.7	0–5%	−0.5 < y < 0.5	³¹

NA49 experiment
Pb+Pb collisions at \(\sqrt{{s}_{NN}}=\) 7.6 GeV
hadron	Yields (4π) ± σ_stat ± σ_sys	σ_total	Centrality	y ranges	Ref.
K⁺	52.9 ± 0.9 ± 3.5 ^(*)	3.6	0–7.2%	extrapolated to 4π	⁴⁰
K⁻	16.0 ± 0.2 ± 0.4	0.45	0–7.2%	extrapolated to 4π	⁴⁰
\({K}_{S}^{0}\)	29.3 ± 0.3 ± 2.9	2.9	0–7.2%	extrapolated to 4π	⁴²

NA49 experiment
Pb+Pb collisions at \(\sqrt{{s}_{NN}}=\) 8.7 GeV
hadron	Yields (4π) ± σ_stat ± σ_sys	σ_total	Centrality	y ranges	Ref.
K⁺	59.1 ± 1.9 ± 3	3.6	0–7.2%	extrapolated to 4π	⁴¹
K⁻	19.2 ± 0.5 ± 1.0	1.1	0–7.2%	extrapolated to 4π	⁴¹
\({K}_{S}^{0}\)	34.2 ± 0.2 ± 3.4	3.4	0–7.2%	extrapolated to 4π	⁴²

CERES experiment
Pb+Au collisions at \(\sqrt{{s}_{NN}}=\) 17.3 GeV
hadron	Yields (y ≈ 0) ± σ_stat ± σ_sys	σ_total	Centrality	y ranges	Ref.
K⁺	31.8 ± 0.6 ± 2.5	2.6	0–7%	y = 0	²⁷
K⁻	19.3 ± 0.4 ± 2.0	2.0	0–7%	y = 0	²⁷
\({K}_{S}^{0}\)	21.2 ± 0.9 ± 1.7	1.9	0–7%	y = 0	^28,29

STAR experiment
Au+Au collisions at \(\sqrt{{s}_{NN}}=\) 62.4 GeV
hadron	Yields (y ≈ 0) ± σ_stat ± σ_sys	σ_total	Centrality	y ranges	Ref.
K⁺	37.6	2.7	0–5%	−0.1 < y < 0.1	³³
K⁻	32.4	2.3	0–5%	−0.1 < y < 0.1	³³
\({K}_{S}^{0}\)	27.4 ± 0.6 ± 2.9	3.0	0–5%	−1< y < 1	³⁴

STAR experiment
Au+Au collisions at \(\sqrt{{s}_{NN}}=\) 130 GeV
hadron	Yields (y ≈ 0) ± σ_uncorr ± σ_corr	σ_total	Centrality	y ranges	Ref.
K⁺	46.2 ± 0.6 ± 6.0	6.0	0–6%	\({-0.1\atop -0.5}\) < y < \({0.1\atop 0.5}\)	³²
K⁻	41.9 ± 0.6 ± 5.4	5.4	0–6%	\({-0.1\atop -0.5}\) < y < \({0.1\atop 0.5}\)	³²
\({K}_{S}^{0}\)	33.9 ± 1.1 ± 5.1	5.2	0–6%	− 0.5 < y < 0.5	³²

STAR experiment
Au+Au collisions at \(\sqrt{{s}_{NN}}=\) 200 GeV
hadron	Yields (y ≈ 0) ± σ_stat ± σ_sys	σ_total	Centrality	y ranges	Ref.
K⁺	51.3	6.5	0–5%	−0.1 < y < 0.1	³³
K⁻	49.5	6.2	0–5%	−0.1 < y < 0.1	³³
\({K}_{S}^{0}\)	43.5	2.4	0–5%	−0.5 < y < 0.5	³⁵

ALICE experiment
Pb+Pb collisions at \(\sqrt{{s}_{NN}}=\) 2760 GeV
hadron	Yields (y ≈ 0) ± σ_stat ± σ_sys	σ_total	Centrality	y ranges	Ref.
K⁺	109	9	0–5%	−0.5 < y < 0.5	³⁶
K⁻	109	9	0–5%	−0.5 < y < 0.5	³⁶
\({K}_{S}^{0}\)	110	10	0–5%	−0.5 < y < 0.5	³⁷

The yields labeled y ≈ 0 and 4π correspond to the rapidity density at mid-rapidity and mean multiplicity in full phase space. The uncertainty fields are left empty in case they are not published. The systematic uncertainties labeled by ^(*) were estimated for this analysis based on the information given in the original papers (see the text). Only results corresponding to the same centrality for charged and neutral kaons are compiled. The “y range” specifies the rapidity range used to obtain a given kaon yield.

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