Phys. Rev. C 66, 054902 (2002) [9 pages]Energy dependence of pion and kaon production in central Pb+Pb collisionsReceived 6 May 2002; published 27 November 2002 Measurements of charged pion and kaon production in central Pb+Pb collisions at 40, 80, and 158 A GeV are presented. These are compared with data at lower and higher energies as well as with results from p+p interactions. The mean pion multiplicity per wounded nucleon increases approximately linearly with sNN1/4 with a change of slope starting in the region 15–40 A GeV. The change from pion suppression with respect to p+p interactions, as observed at low collision energies, to pion enhancement at high energies occurs at about 40A GeV. A nonmonotonic energy dependence of the ratio of K+ to π+ yields is observed, with a maximum close to 40A GeV and an indication of a nearly constant value at higher energies. The measured dependences may be related to an increase of the entropy production and a decrease of the strangeness to entropy ratio in central Pb+Pb collisions in the low SPS energy range, which is consistent with the hypothesis that a transient state of deconfined matter is created above these energies. Other interpretations of the data are also discussed. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevC.66.054902
DOI:
10.1103/PhysRevC.66.054902
PACS:
25.75.-q
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