Chemical Potentials of Light Flavor Quarks from Yield Ratios of Negative to Positive Particles in Au+Au Collisions at RHIC

Figure 1

Midrapidity () double-differential spectra for , , , , , and in central Au+Au collisions at , 11.5, 19.6, 27, 39, 62.4, 130, and 200 GeV, where the centrality interval at 130 GeV is 0–6% and at other energies is 0–5%. The different symbols represent the measurements done by the STAR experiment [19, 21] and the curves represent the results fitted by the (two-component) standard distribution. The values of parameters can be found in Table 1.