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          Institute: MPI für Physik     Collection: MPI für Physik     Display Documents



ID: 544591.0, MPI für Physik / MPI für Physik
Energy Dependence of Pion and Kaon Production in Central Pb+Pb Collisions
Authors:The NA49 Collaboration; Afanasiev, S. V.; Eckardt, V.; Filip, P.; Freund, P.; Karev, A.; Sammer, T.; Schmitz, N.; Seyboth, P.; et al.
Date of Publication (YYYY-MM-DD):2002
Title of Journal:Physical Review C
Journal Abbrev.:Phys.Rev.C
Issue / Number:66
Start Page:054902
Audience:Not Specified
Intended Educational Use:No
Abstract / Description:Measurements of charged pion and kaon production in central Pb+Pb collisions at 40, 80 and 158 AGeV 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 s_NN^1/4 with a change of slope starting in the region 15-40 AGeV. 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 40 AGeV. A non-monotonic energy dependence of the ratio of K^+ to pi^+ yields is observed, with a maximum close to 40 AGeV 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.
Classification / Thesaurus:NA49
Comment of the Author/Creator:revised version to appear in Phys. Rev. C, 33 pages including 11 figures
External Publication Status:published
Document Type:Article
Communicated by:N.N.
Affiliations:MPI für Physik
Identifiers:LOCALID:MPP-2002-181
URL:http://www.slac.stanford.edu/spires/find/hep/www?r...
URL:http://arXiv.org/abs/nucl-ex/0205002
URL:http://publications.mppmu.mpg.de/?action=search&mp...
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