Chemical Property in Heavy Ion Collisions

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概要

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• K^-/K^+ and p^^-/p ratios measured in 158 A・GeV Pb + Pb collisions are shown as a function of centrality and transverse momentum (P_t). Little significant centrality dependence in neither K^-/K^+ nor p^^-/p ratios are observed and they are almost constant as a function of P_t. The chemical freeze-out temperature T_<ch> and the chemical potentials for both light and strange quarks (μ_q,μ_s) are extracted by comparing the present data with simple model predictions. The μ_q,μ_s and T_<ch> from the NA44 are compared with those obtained from similar analysis of SPS S + A and AGS Si + A data. The chemical freeze-out temperature T_<ch> in CERN energy is higher than thermal freeze-out temperature T_<fo> which is extracted from transverse momentum distribution of charged hadrons. In AGS energy T_<ch> is close to T_<fo>.

• 1998-03-20

著者

• Kaneta Masashi

  Department Of Physics Hiroshima University : Nbi Lanl Columbia Nantes Hiroshima Cern Rusjer Boskovic

関連論文

• Chemical Property in Heavy Ion Collisions

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