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

The collaboration
Phys.Rev.C 83 (2011) 024901, 2011.

Abstract (data abstract)
We present results on strange and multi-strange particle production in Au+Au collisions at √sNN=62.4 GeV as measured with the STAR detector at RHIC. Mid-rapidity transverse momentum spectra and integrated yields of KS0, Λ, Ξ, Ω and their anti-particles are presented for different centrality classes. The particle yields and ratios follow a smooth energy dependence. Chemical freeze-out parameters, temperature, baryon chemical potential and strangeness saturation factor obtained from the particle yields are presented. Intermediate transverse momentum (pT) phenomena are discussed based on the ratio of the measured baryon-to-meson spectra and nuclear modification factor. The centrality dependence of various measurements presented show a similar behavior as seen in Au+Au collisions at √sNN=200 GeV.

• #### Figure 2

Data from Figure 2

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Correction factors (acceptance × efficiency) for the most central events ( 0−5% for KS0, Λ and Ξ; 0−20% for Ω)...

• #### Figure 3 a)

Data from Figure 3 a)

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Efficiency corrected pT spectra for the different centrality bins and for the various particles. Note that 7 centrality bins have...

• #### Figure 3 b)

Data from Figure 3 b)

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Efficiency corrected pT spectra for the different centrality bins and for the various particles. Note that 7 centrality bins have...

• #### Figure 3 c)

Data from Figure 3 c)

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Efficiency corrected pT spectra for the different centrality bins and for the various particles. Note that 7 centrality bins have...

• #### Figure 3 d)

Data from Figure 3 d)

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Efficiency corrected pT spectra for the different centrality bins and for the various particles. Note that 7 centrality bins have...

• #### Figure 3 e)

Data from Figure 3 e)

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Efficiency corrected pT spectra for the different centrality bins and for the various particles. Note that 7 centrality bins have...

• #### Figure 3 f)

Data from Figure 3 f)

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Efficiency corrected pT spectra for the different centrality bins and for the various particles. Note that 7 centrality bins have...

• #### Figure 3 g)

Data from Figure 3 g)

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Efficiency corrected pT spectra for the different centrality bins and for the various particles. Note that 7 centrality bins have...

• #### Figure 4

Data from Figure 4

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Extrapolated average transverse momenta ⟨pT ⟩ as a function of dNch/dy for different particle species in Au+Au collisions at 62.4...

• #### Figure 5 left

Data from Figure 5 left

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KS0 dN/dpT spectra compared to the charged Kaon spectra for the event centrality of 0-5% and 30-40%. The charged Kaons...

• #### Figure 5 right

Data from Figure 5 right

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KS0 dN/dpT spectra compared to the charged Kaon spectra for the event centrality of 0-5% and 30-40%. The charged Kaons...

• #### Figure 6 up

Data from Figure 6 up

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Strange particle production yields at mid-rapidity in central Au+Au and Pb+Pb collisions versus the center of mass energy √sNN. The...

• #### Figure 6 down

Data from Figure 6 down

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Strange particle production yields at mid-rapidity in central Au+Au and Pb+Pb collisions versus the center of mass energy √sNN. The...

• #### Figure 7

Data from Figure 7

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Anti-baryon to baryon yield ratios for strange baryons versus the center of mass energy √sNN. Λ/Λ is shown in the...

• #### Figure 8

Data from Figure 8

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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...

• #### Figure 9

Data from Figure 9

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Particle-yield ratios as obtained by measurements (black dots) for the most central (0–5%) Au+Au collisions at 62.4 GeV and statistical...

• #### Figure 10 (a)

Data from Figure 10 (a)

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

• #### Figure 10 (b)

Data from Figure 10 (b)

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

• #### Figure 11 up

Data from Figure 11 up

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Temperature and baryon chemical potential obtained from thermal model fits as a function of √sNN (see Ref. [22]). The dashed...

• #### Figure 11 down

Data from Figure 11 down

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Temperature and baryon chemical potential obtained from thermal model fits as a function of √sNN (see Ref. [22]). The dashed...

• #### Figure 12 left down

Data from Figure 12 left down

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Ratio of baryon (solid symbols) and antibaryon (open symbols) to π+ as a function of dNch/dy for √sNN=62.4 GeV (left)...

• #### Figure 12 left up

Data from Figure 12 left up

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Ratio of baryon (solid symbols) and antibaryon (open symbols) to π+ as a function of dNch/dy for √sNN=62.4 GeV (left)...

• #### Figure 12 right down

Data from Figure 12 right down

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Ratio of baryon (solid symbols) and antibaryon (open symbols) to π+ as a function of dNch/dy for √sNN=62.4 GeV (left)...

• #### Figure 12 right up

Data from Figure 12 right up

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Ratio of baryon (solid symbols) and antibaryon (open symbols) to π+ as a function of dNch/dy for √sNN=62.4 GeV (left)...

• #### Figure 13

Data from Figure 13

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Ratio of baryon (solid symbols) and antibaryon (open symbols) to π− as a function of √sNN. The lines are the...

• #### Figure 14

Data from Figure 14

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Nuclear modification factor RCP, calculated as the ratio between 0–10% central spectra and 40–80% peripheral spectra, for π, K0S, Λ,...

• #### Figure 15

Data from Figure 15

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Nuclear modification factor RCP, calculated as the ratio between 0–5% central spectra and 40–60% peripheral spectra, for Λ and Ξ...

• #### Figure 16

Data from Figure 16

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Λ/K0S ratio as a function of transverse momentum for different centrality classes. 0–5% (solid circles), 40–60% (open squares), and 60–80%...

• #### Figure 17

Data from Figure 17

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Maximum value of the Λ/K0S ratio from Au+Au collisions at 62.4 GeV (solid circles) and 200 GeV (open circles) [11]...