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Figure 2

Correction factors (acceptance × efficiency) for the most central events ( 0−5% for KS0, Λ and Ξ; 0−20% for Ω) at mid-rapidity (|y| < 1) as a function of pT for the different particle species as obtained via embedding. The branching ratio of the measured decay channel is not factored into this plot.

Figure 2

Correction factors (acceptance × efficiency) for the most central events ( 0−5% for KS0, Λ and Ξ; 0−20% for Ω) at mid-rapidity (|y| < 1) as a function of pT for the different particle species as obtained via embedding. The branching ratio of the measured decay channel is not factored into this plot.

Figure 3 a)

Efficiency corrected pT spectra for the different centrality bins and for the various particles. Note that 7 centrality bins have been used for the KS0 and the Λ while only 6 and 3 have been used for the Ξ and Ω, respectively. Errors are statistical only. The Λ spectra are corrected for the feed-down of the Ξ decay.

Figure 3 a)

Efficiency corrected pT spectra for the different centrality bins and for the various particles. Note that 7 centrality bins have been used for the KS0 and the Λ while only 6 and 3 have been used for the Ξ and Ω, respectively. Errors are statistical only. The Λ spectra are corrected for the feed-down of the Ξ decay.

Figure 3 b)

Efficiency corrected pT spectra for the different centrality bins and for the various particles. Note that 7 centrality bins have been used for the KS0 and the Λ while only 6 and 3 have been used for the Ξ and Ω, respectively. Errors are statistical only. The Λ spectra are corrected for the feed-down of the Ξ decay.

Figure 3 b)

Efficiency corrected pT spectra for the different centrality bins and for the various particles. Note that 7 centrality bins have been used for the KS0 and the Λ while only 6 and 3 have been used for the Ξ and Ω, respectively. Errors are statistical only. The Λ spectra are corrected for the feed-down of the Ξ decay.

Figure 3 c)

Efficiency corrected pT spectra for the different centrality bins and for the various particles. Note that 7 centrality bins have been used for the KS0 and the Λ while only 6 and 3 have been used for the Ξ and Ω, respectively. Errors are statistical only. The Λ spectra are corrected for the feed-down of the Ξ decay.

Figure 3 c)

Efficiency corrected pT spectra for the different centrality bins and for the various particles. Note that 7 centrality bins have been used for the KS0 and the Λ while only 6 and 3 have been used for the Ξ and Ω, respectively. Errors are statistical only. The Λ spectra are corrected for the feed-down of the Ξ decay.

Figure 3 d)

Efficiency corrected pT spectra for the different centrality bins and for the various particles. Note that 7 centrality bins have been used for the KS0 and the Λ while only 6 and 3 have been used for the Ξ and Ω, respectively. Errors are statistical only. The Λ spectra are corrected for the feed-down of the Ξ decay.

Figure 3 d)

Efficiency corrected pT spectra for the different centrality bins and for the various particles. Note that 7 centrality bins have been used for the KS0 and the Λ while only 6 and 3 have been used for the Ξ and Ω, respectively. Errors are statistical only. The Λ spectra are corrected for the feed-down of the Ξ decay.

Figure 3 e)

Efficiency corrected pT spectra for the different centrality bins and for the various particles. Note that 7 centrality bins have been used for the KS0 and the Λ while only 6 and 3 have been used for the Ξ and Ω, respectively. Errors are statistical only. The Λ spectra are corrected for the feed-down of the Ξ decay.

Figure 3 e)

Efficiency corrected pT spectra for the different centrality bins and for the various particles. Note that 7 centrality bins have been used for the KS0 and the Λ while only 6 and 3 have been used for the Ξ and Ω, respectively. Errors are statistical only. The Λ spectra are corrected for the feed-down of the Ξ decay.

Figure 3 f)

Efficiency corrected pT spectra for the different centrality bins and for the various particles. Note that 7 centrality bins have been used for the KS0 and the Λ while only 6 and 3 have been used for the Ξ and Ω, respectively. Errors are statistical only. The Λ spectra are corrected for the feed-down of the Ξ decay.

Figure 3 f)

Efficiency corrected pT spectra for the different centrality bins and for the various particles. Note that 7 centrality bins have been used for the KS0 and the Λ while only 6 and 3 have been used for the Ξ and Ω, respectively. Errors are statistical only. The Λ spectra are corrected for the feed-down of the Ξ decay.

Figure 3 g)

Efficiency corrected pT spectra for the different centrality bins and for the various particles. Note that 7 centrality bins have been used for the KS0 and the Λ while only 6 and 3 have been used for the Ξ and Ω, respectively. Errors are statistical only. The Λ spectra are corrected for the feed-down of the Ξ decay.

Figure 3 g)

Efficiency corrected pT spectra for the different centrality bins and for the various particles. Note that 7 centrality bins have been used for the KS0 and the Λ while only 6 and 3 have been used for the Ξ and Ω, respectively. Errors are statistical only. The Λ spectra are corrected for the feed-down of the Ξ decay.

Figure 4

Extrapolated average transverse momenta ⟨pT ⟩ as a function of dNch/dy for different particle species in Au+Au collisions at 62.4 GeV. Statistical uncertainties are represented by the error bars at the points while the systematic uncertainties are represented by the gray bars. The π, charged K and p data were extracted from Ref. [14].

Figure 4

Extrapolated average transverse momenta ⟨pT ⟩ as a function of dNch/dy for different particle species in Au+Au collisions at 62.4 GeV. Statistical uncertainties are represented by the error bars at the points while the systematic uncertainties are represented by the gray bars. The π, charged K and p data were extracted from Ref. [14].

Figure 5 left

KS0 dN/dpT spectra compared to the charged Kaon spectra for the event centrality of 0-5% and 30-40%. The charged Kaons data points are for rapidity range of |y| < 0.1 and were extracted from Ref. [14].

Figure 5 left

KS0 dN/dpT spectra compared to the charged Kaon spectra for the event centrality of 0-5% and 30-40%. The charged Kaons data points are for rapidity range of |y| < 0.1 and were extracted from Ref. [14].

Figure 5 right

KS0 dN/dpT spectra compared to the charged Kaon spectra for the event centrality of 0-5% and 30-40%. The charged Kaons data points are for rapidity range of |y| < 0.1 and were extracted from Ref. [14].

Figure 5 right

KS0 dN/dpT spectra compared to the charged Kaon spectra for the event centrality of 0-5% and 30-40%. The charged Kaons data points are for rapidity range of |y| < 0.1 and were extracted from Ref. [14].

Figure 6 up

Strange particle production yields at mid-rapidity in central Au+Au and Pb+Pb collisions versus the center of mass energy √sNN. The top panel shows results for K0S and Λ. The AGS values are from E896 [1] (centrality 0 − 5 %). The SPS values are from NA49 [20] (centrality 0 − 7 %) and the RHIC values are from STAR [4, 15] (centrality 0 − 5 %). For the multi-strange baryons Ξ and Ω (bottom panel), the SPS results are from NA57 [2] (centrality 0 − 11 %) and the RHIC values are from STAR [15, 21] (centrality 0 − 20 %).

Figure 6 up

Strange particle production yields at mid-rapidity in central Au+Au and Pb+Pb collisions versus the center of mass energy √sNN. The top panel shows results for K0S and Λ. The AGS values are from E896 [1] (centrality 0 − 5 %). The SPS values are from NA49 [20] (centrality 0 − 7 %) and the RHIC values are from STAR [4, 15] (centrality 0 − 5 %). For the multi-strange baryons Ξ and Ω (bottom panel), the SPS results are from NA57 [2] (centrality 0 − 11 %) and the RHIC values are from STAR [15, 21] (centrality 0 − 20 %).

Figure 6 down

Strange particle production yields at mid-rapidity in central Au+Au and Pb+Pb collisions versus the center of mass energy √sNN. The top panel shows results for K0S and Λ. The AGS values are from E896 [1] (centrality 0 − 5 %). The SPS values are from NA49 [20] (centrality 0 − 7 %) and the RHIC values are from STAR [4, 15] (centrality 0 − 5 %). For the multi-strange baryons Ξ and Ω (bottom panel), the SPS results are from NA57 [2] (centrality 0 − 11 %) and the RHIC values are from STAR [15, 21] (centrality 0 − 20 %).

Figure 6 down

Strange particle production yields at mid-rapidity in central Au+Au and Pb+Pb collisions versus the center of mass energy √sNN. The top panel shows results for K0S and Λ. The AGS values are from E896 [1] (centrality 0 − 5 %). The SPS values are from NA49 [20] (centrality 0 − 7 %) and the RHIC values are from STAR [4, 15] (centrality 0 − 5 %). For the multi-strange baryons Ξ and Ω (bottom panel), the SPS results are from NA57 [2] (centrality 0 − 11 %) and the RHIC values are from STAR [15, 21] (centrality 0 − 20 %).

Figure 7

Anti-baryon to baryon yield ratios for strange baryons versus the center of mass energy √sNN. Λ/Λ is shown in the top panel while the multi-strange baryons are on the bottom panel. The data from AGS are not corrected for the weak decay feed-down from the multistrange baryons while the data from SPS and RHIC are corrected. The lines are the results of a thermal model calculation (see text section IV A). The AGS values are from E896 [1] (centrality 0 − 5 %). The SPS values are from NA49 [20] (centrality 0 − 7 %) and the RHIC values are from STAR [4, 15] (centrality 0 − 5 %). For the multi- strange baryons Ξ and Ω (bottom panel), the SPS results are from NA57 [2] (centrality 0 − 11 %) and the RHIC values are from STAR [15, 21] (centrality 0 − 20 %).

Figure 7

Anti-baryon to baryon yield ratios for strange baryons versus the center of mass energy √sNN. Λ/Λ is shown in the top panel while the multi-strange baryons are on the bottom panel. The data from AGS are not corrected for the weak decay feed-down from the multistrange baryons while the data from SPS and RHIC are corrected. The lines are the results of a thermal model calculation (see text section IV A). The AGS values are from E896 [1] (centrality 0 − 5 %). The SPS values are from NA49 [20] (centrality 0 − 7 %) and the RHIC values are from STAR [4, 15] (centrality 0 − 5 %). For the multi- strange baryons Ξ and Ω (bottom panel), the SPS results are from NA57 [2] (centrality 0 − 11 %) and the RHIC values are from STAR [15, 21] (centrality 0 − 20 %).

Figure 8

Antibaryon-to-baryon yield ratios for strange particles and protons as a function of dNch/dy at √sNN=62.4 and 200 GeV. The p data were extracted from Ref. [14]. The √sNN=200 GeV strange hadron data were extracted from Ref. [15].

Figure 8

Antibaryon-to-baryon yield ratios for strange particles and protons as a function of dNch/dy at √sNN=62.4 and 200 GeV. The p data were extracted from Ref. [14]. The √sNN=200 GeV strange hadron data were extracted from Ref. [15].

Figure 9

Particle-yield ratios as obtained by measurements (black dots) for the most central (0–5%) Au+Au collisions at 62.4 GeV and statistical model predictions (lines). The ratios indicated by the dashed lines (blue) were obtained by using only π, K, and protons, whereas the ratios indicated by the full lines (green) were obtained by also using the hyperons in the fit.

Figure 9

Particle-yield ratios as obtained by measurements (black dots) for the most central (0–5%) Au+Au collisions at 62.4 GeV and statistical model predictions (lines). The ratios indicated by the dashed lines (blue) were obtained by using only π, K, and protons, whereas the ratios indicated by the full lines (green) were obtained by also using the hyperons in the fit.

Figure 10 (a)

Chemical freeze-out temperature Tch (a) and strangeness saturation factor γs (b) as a function of the mean number of participants.

Figure 10 (a)

Chemical freeze-out temperature Tch (a) and strangeness saturation factor γs (b) as a function of the mean number of participants.

Figure 10 (b)

Chemical freeze-out temperature Tch (a) and strangeness saturation factor γs (b) as a function of the mean number of participants.

Figure 10 (b)

Chemical freeze-out temperature Tch (a) and strangeness saturation factor γs (b) as a function of the mean number of participants.

Figure 11 up

Temperature and baryon chemical potential obtained from thermal model fits as a function of √sNN (see Ref. [22]). The dashed lines correspond to the parametrizations given in Ref. [22]. The solid stars show the result for √sNN=62.4 and 200 GeV.

Figure 11 up

Temperature and baryon chemical potential obtained from thermal model fits as a function of √sNN (see Ref. [22]). The dashed lines correspond to the parametrizations given in Ref. [22]. The solid stars show the result for √sNN=62.4 and 200 GeV.

Figure 11 down

Temperature and baryon chemical potential obtained from thermal model fits as a function of √sNN (see Ref. [22]). The dashed lines correspond to the parametrizations given in Ref. [22]. The solid stars show the result for √sNN=62.4 and 200 GeV.

Figure 11 down

Temperature and baryon chemical potential obtained from thermal model fits as a function of √sNN (see Ref. [22]). The dashed lines correspond to the parametrizations given in Ref. [22]. The solid stars show the result for √sNN=62.4 and 200 GeV.

Figure 12 left down

Ratio of baryon (solid symbols) and antibaryon (open symbols) to π+ as a function of dNch/dy for √sNN=62.4 GeV (left) and √sNN=200 GeV (right). The π and p data were extracted from Ref. [14].

Figure 12 left down

Ratio of baryon (solid symbols) and antibaryon (open symbols) to π- as a function of dNch/dy for √sNN=62.4 GeV (left) and √sNN=200 GeV (right). The π and p data were extracted from Ref. [14].

Figure 12 left up

Ratio of baryon (solid symbols) and antibaryon (open symbols) to π+ as a function of dNch/dy for √sNN=62.4 GeV (left) and √sNN=200 GeV (right). The π and p data were extracted from Ref. [14].

Figure 12 left up

Ratio of baryon (solid symbols) and antibaryon (open symbols) to π- as a function of dNch/dy for √sNN=62.4 GeV (left) and √sNN=200 GeV (right). The π and p data were extracted from Ref. [14].

Figure 12 right down

Ratio of baryon (solid symbols) and antibaryon (open symbols) to π+ as a function of dNch/dy for √sNN=62.4 GeV (left) and √sNN=200 GeV (right). The π and p data were extracted from Ref. [14].

Figure 12 right down

Ratio of baryon (solid symbols) and antibaryon (open symbols) to π- as a function of dNch/dy for √sNN=62.4 GeV (left) and √sNN=200 GeV (right). The π and p data were extracted from Ref. [14].

Figure 12 right up

Ratio of baryon (solid symbols) and antibaryon (open symbols) to π+ as a function of dNch/dy for √sNN=62.4 GeV (left) and √sNN=200 GeV (right). The π and p data were extracted from Ref. [14].

Figure 12 right up

Ratio of baryon (solid symbols) and antibaryon (open symbols) to π- as a function of dNch/dy for √sNN=62.4 GeV (left) and √sNN=200 GeV (right). The π and p data were extracted from Ref. [14].

Figure 13

Ratio of baryon (solid symbols) and antibaryon (open symbols) to π− as a function of √sNN. The lines are the results of the thermal model calculation (see text Sec. 4a). The SPS values are from NA49 [20] (centrality 0–7%) and the RHIC values are from STAR [4, 15] (centrality 0–5%). For the multistrange baryons Ξ and Ω (bottom), the SPS results are from NA57 [2] (centrality 0–11%) and the RHIC values are from STAR [15, 21] (centrality 0–20%).

Figure 13

Ratio of baryon (solid symbols) and antibaryon (open symbols) to π− as a function of √sNN. The lines are the results of the thermal model calculation (see text Sec. 4a). The SPS values are from NA49 [20] (centrality 0–7%) and the RHIC values are from STAR [4, 15] (centrality 0–5%). For the multistrange baryons Ξ and Ω (bottom), the SPS results are from NA57 [2] (centrality 0–11%) and the RHIC values are from STAR [15, 21] (centrality 0–20%).

Figure 14

Nuclear modification factor RCP, calculated as the ratio between 0–10% central spectra and 40–80% peripheral spectra, for π, K0S, Λ, and Ξ particles in Au+Au collisions at 62.4 GeV. The π RCP values were extracted from Ref. [10]. The gray band on the right side of the plot shows the uncertainties on the estimation of the number of binary collisions and the gray band on the lower left side indicates the uncertainties on the number of participants.

Figure 14

Nuclear modification factor RCP, calculated as the ratio between 0–10% central spectra and 40–80% peripheral spectra, for π, K0S, Λ, and Ξ particles in Au+Au collisions at 62.4 GeV. The π RCP values were extracted from Ref. [10]. The gray band on the right side of the plot shows the uncertainties on the estimation of the number of binary collisions and the gray band on the lower left side indicates the uncertainties on the number of participants.

Figure 15

Nuclear modification factor RCP, calculated as the ratio between 0–5% central spectra and 40–60% peripheral spectra, for Λ and Ξ particles measured in Au + Au collisions at 62.4 GeV. The gray band corresponds to the equivalent RCP curve for the Λ particles measured in Au+Au collisions at 200 GeV [15].

Figure 15

Nuclear modification factor RCP, calculated as the ratio between 0–5% central spectra and 40–60% peripheral spectra, for Λ and Ξ particles measured in Au + Au collisions at 62.4 GeV. The gray band corresponds to the equivalent RCP curve for the Λ particles measured in Au+Au collisions at 200 GeV [15].

Figure 16

Λ/K0S ratio as a function of transverse momentum for different centrality classes. 0–5% (solid circles), 40–60% (open squares), and 60–80% (solid triangles) in Au+Au collisions at 62.4 GeV.

Figure 16

Λ/K0S ratio as a function of transverse momentum for different centrality classes. 0–5% (solid circles), 40–60% (open squares), and 60–80% (solid triangles) in Au+Au collisions at 62.4 GeV.

Figure 17

Maximum value of the Λ/K0S ratio from Au+Au collisions at 62.4 GeV (solid circles) and 200 GeV (open circles) [11] as a function of ⟨Npart⟩ for different centrality classes. The lowest ⟨Npart⟩ point corresponds to p+p collisions at 200 GeV [44]. The maximum of the Λ––/K0S from Au+Au collisions at 62.4 GeV is shown as solid triangles.

Figure 17

Maximum value of the Λ/K0S ratio from Au+Au collisions at 62.4 GeV (solid circles) and 200 GeV (open circles) [11] as a function of ⟨Npart⟩ for different centrality classes. The lowest ⟨Npart⟩ point corresponds to p+p collisions at 200 GeV [44]. The maximum of the Λ––/K0S from Au+Au collisions at 62.4 GeV is shown as solid triangles.

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Strange and Multi-strange Particle Production in Au+Au Collisions at $\sqrt{s_{NN}}$ = 62.4 GeV

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Version 2 Strange and Multi-strange Particle Production in Au+Au Collisions at $\sqrt{s_{NN}}$ = 62.4 GeV

Version 2
Strange and Multi-strange Particle Production in Au+Au Collisions at $\sqrt{s_{NN}}$ = 62.4 GeV