Energy-Dependent Chemical Potentials of Light Hadrons and Quarks Based on Transverse Momentum Spectra and Yield Ratios of Negative to Positive Particles

Figure 2

Mid-rapidity transverse momentum spectra for positive (, , and ) and negative (, , and ) particles produced in central Au-Au collisions at (a, d) 7.7, (b, e) 11.5, and (c, f) 19.6 GeV. The symbols represent the experimental data recorded by the STAR Collaboration [39]. The errors are the combined statistical and systematic ones, and the curves are our results by the two-component Erlang distribution.