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

Figure 7

Transverse momentum spectra for (a, b) and (c, d) in inelastic pp collisions at SPS energies (6.3, 7.7, 8.8, 12.3, and 17.3 GeV). The symbols represent the experimental data reported by the NA61/SHINE Collaboration [48]. Spectra at different energies are scaled by appropriate factors for better visibility. The errors are quadratic sum of statistical errors and systematic errors. The curves are fits of one- or two-component Erlang function to the spectra, where the dash curve in the figure is drawn to guide the eye.