Chemical Potentials of Quarks Extracted from Particle Transverse Momentum Distributions in Heavy Ion Collisions at RHIC Energies

Table 1

Parameter values corresponding to the curves in Figures 1 and 2 for Au-Au collisions at √𝑠_𝑁𝑁=130 and 200 GeV, respectively. The values for positively/negatively charged particles are given in terms of “the first value/the second value” in the case of the two values being different. The relative errors estimated for 𝑇_1,2 and 𝑘₁ are less than 6% and 0.5%, respectively.

Figure	Centrality	Particle	𝑇1 (GeV)	𝑘1	𝑇2 (GeV)	𝜒^2/dof
Figures 1(a) and 1(b)	0–5%	𝜋^+/𝜋^−	0.091/0.089	0.979/0.982	0.220/0.233	1.412/1.512
		𝐾^+/𝐾^−	0.150/0.110	0.996	0.350/0.300	1.609/1.309
		𝑝/𝑝	0.192/0.205	0.995/0.979	0.370/0.345	1.461/1.694
Figures 1(c) and 1(d)	15–30%	𝜋^+/𝜋^−	0.087/0.089	0.986/0.985	0.228/0.232	1.575/1.494
		𝐾^+/𝐾^−	0.141/0.130	0.979/0.977	0.260/0.263	1.330/1.042
		𝑝/𝑝	0.183/0.180	0.989/0.983	0.330/0.304	0.846/1.944
Figures 1(e) and 1(f)	60–92%	𝜋^+/𝜋^−	0.082/0.078	0.995/0.989	0.250/0.215	0.965/0.435
		𝐾^+/𝐾^−	0.075/0.079	0.999	0.230/0.221	1.200/0.905
		𝑝/𝑝	0.120/0.110	0.999	0.305/0.390	0.931/1.676
Figures 2(a) and 2(b)	0–5%	𝜋^+/𝜋^−	0.122/0.123	0.970/0.969	0.254	0.562/0.634
		𝐾^+/𝐾^−	0.175	0.981/0.979	0.350	0.769/1.245
		𝑝/𝑝	0.263	0.995/0.993	0.470/0.450	0.281/0.604
Figures 2(c) and 2(d)	60–92%	𝜋^+/𝜋^−	0.114	0.989	0.276	1.879^a/1.839^a
		𝐾^+/𝐾^−	0.147	0.993	0.350/0.340	0.413/0.603
		𝑝/𝑝	0.194/0.190	0.998/0.997	0.430/0.380	0.651/0.542

aThe last point is not included in the calculation of 𝜒²/dof due to the low statistics.