Showing papers by "Kreso Kadija published in 2002"
Joint Institute for Nuclear Research1, Hungarian Academy of Sciences2, Polish Academy of Sciences3, University of Birmingham4, University of Marburg5, Goethe University Frankfurt6, GSI Helmholtz Centre for Heavy Ion Research7, Comenius University in Bratislava8, CERN9, University of Washington10, Max Planck Society11, Eötvös Loránd University12, National and Kapodistrian University of Athens13, University of California, Los Angeles14, Kent State University15, University of Houston16, University of Warsaw17, Massachusetts Institute of Technology18
TL;DR: In this article, the mean pion multiplicity per wounded nucleon increases approximately linearly with a change of slope starting in the region 15--40 A GeV, and 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.
Abstract: 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 ${s}_{\mathrm{NN}}^{1/4}$ 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 ${\ensuremath{\pi}}^{+}$ 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.
549 citations
Joint Institute for Nuclear Research1, University of Birmingham2, Comenius University in Bratislava3, CERN4, University of Washington5, Max Planck Society6, National and Kapodistrian University of Athens7, University of California, Los Angeles8, Kent State University9, University of Houston10, University of Warsaw11, Massachusetts Institute of Technology12
TL;DR: In this article, the 10% most central Pb+Pb interactions at 158GeV/c per nucleon where the average number of participants Npart is about 335, were analyzed using a global reconstruction procedure, which allowed a measurement of 4π integrated yields to be made for the first time.
69 citations
GSI Helmholtz Centre for Heavy Ion Research1, Joint Institute for Nuclear Research2, Hungarian Academy of Sciences3, Polish Academy of Sciences4, University of Birmingham5, Goethe University Frankfurt6, Comenius University in Bratislava7, CERN8, University of Washington9, Max Planck Society10, Eötvös Loránd University11, University of Marburg12, National and Kapodistrian University of Athens13, University of California, Los Angeles14, Kent State University15, University of Houston16, University of Warsaw17, Massachusetts Institute of Technology18
TL;DR: In this paper, the shape of the rapidity distribution becomes flatter with increasing beam energy and the multiplicities at mid-rapidity as well as the total yields are studied as a function of collision energy including AGS measurements.
Abstract: In this paper we present recent results from the NA49 experiment for A and Λ hyperons produced in central Pb+Pb collisions at 40, 80 and 158 A GeV. Transverse mass spectra and rapidity distributions for A are shown for all three energies. The shape of the rapidity distribution becomes flatter with increasing beam energy. The multiplicities at mid-rapidity as well as the total yields are studied as a function of collision energy including AGS measurements. The ratio Λ/π at mid-rapidity and in 4π has a maximum around 40 A GeV. In addition, Λ rapidity distributions have been measured at 40 and 80 A GeV, which allows us to study the A/A ratio.
34 citations
01 Apr 2002
25 citations
01 Jan 2002
1 citations