We will address the physics of K-/K+ and p̄/p ratios measured in 158 A GeV Pb + Pb collisions as a function of centrality and transverse momentum. We observe little significant centrality dependence in neither K-/K+ nor p̄/p ratios and they are almost constant as a function of PT. In addition to the chemical freeze-out temperature Tch, we extract the chemical potentials for both light and strange quarks (μq and μs) by comparing the present data with simple model predictions. Tch is greater than the thermal freeze-out temperature which is extracted from the transverse momentum distribution of charged hadrons.
|ジャーナル||Journal of Physics G: Nuclear and Particle Physics|
|出版ステータス||Published - 1997 12|
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