TY - JOUR
T1 - Kaon and proton ratios from central Pb+Pb collisions at the CERN SPS
AU - Kaneta, M.
N1 - Funding Information:
NA44 collaboratiotnh ankst hes taffo f the CERN PS-SPS acceleratocro mplexfo r their excellenwt ork. We are gratefutlo the technicasl taffa t C,E RN and the collaboratinign sti-tutesf or their vahlablec ontributionW. e also wish to thank for the supportg ivenb y the Austrian Fonds zur FSrderungd er WissenschaftlicheFno rschungt;h e ScienceR esearch Council of Denmark;t he JapaneseS ocietyf or the Promotiono f Science;t he Ministry of EducationS, ciencea nd Culture,J apan;the ScienceR esearchC ouncilof Sweden;t he NationalS cienceF oundationt,h e US Departmenotf Energy,a nd the W.B. Keck Foundation.
PY - 1998/8/10
Y1 - 1998/8/10
N2 - K- / K+ and p̄/p ratios measured in 158 A·GeV Pb+Pb collisions are shown as a function of transverse momentum PT and centrality in top 8.5% central region. Little centrality dependence of the K- / K+ and p̄/p ratios is observed. The transverse mass mT distribution and dN/dy of K+, K-1, p and p around mid-rapidity are obtained. The temperature Tch and the chemical potentials for both light and strange quarks (μq,μs) at chemical freeze-out are determined by applying simple thermodynamical model to the present data. The resultant μq, μs and Tch are compared with those obtained from similar analysis of SPS S+A and AGS Si+A data. The chemical freeze-out temperature Tch at CERN energies is higher than thermal freeze-out temperature Tfo which is extracted from mT distribution of charged hadrons. At AGS energies Tch is close to Tfo.
AB - K- / K+ and p̄/p ratios measured in 158 A·GeV Pb+Pb collisions are shown as a function of transverse momentum PT and centrality in top 8.5% central region. Little centrality dependence of the K- / K+ and p̄/p ratios is observed. The transverse mass mT distribution and dN/dy of K+, K-1, p and p around mid-rapidity are obtained. The temperature Tch and the chemical potentials for both light and strange quarks (μq,μs) at chemical freeze-out are determined by applying simple thermodynamical model to the present data. The resultant μq, μs and Tch are compared with those obtained from similar analysis of SPS S+A and AGS Si+A data. The chemical freeze-out temperature Tch at CERN energies is higher than thermal freeze-out temperature Tfo which is extracted from mT distribution of charged hadrons. At AGS energies Tch is close to Tfo.
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U2 - 10.1016/S0375-9474(98)00340-6
DO - 10.1016/S0375-9474(98)00340-6
M3 - Article
AN - SCOPUS:0032504471
SN - 0375-9474
VL - 638
SP - 419c-422c
JO - Nuclear Physics A
JF - Nuclear Physics A
IS - 1-2
ER -