Recent Changes

Slides:
Part 1 (28pp)(23pp)
Part 2 (15pp)
Part 3 (9pp)(35pp)

Final NA49 results on the energy dependence of hadron production in central Pb+Pb collisions will be shown and discussed with respect to possible indications for the onset of deconfinement. Around 30 $A$GeV a rapid change of the energy dependence of pion and kaon yields as well as of the mean transverse mass is observed. Furthermore preliminary data on the system size dependence of hadron production at 158 $A$ and 40 $A$GeV will be shown. Besides the inclusive hadron production also the directed and elliptic flow of hadrons has been measured for pions, kaons and protons at 40 $A$GeV. At 158 $A$GeV we measured in addition the v2 of $K^{0}_{s}$ and $\Lambda$. The observation of significant elliptic flow and its mass dependence suggests strong collective behavior of the matter produced in collisions of heavy nuclei already at the SPS. Scaling properties of elliptic flow of different particle species have been tested at 158 $A$ GeV. Moreover, the HBT-radii of the pion emitting source is obtained from the study of the corresponding Bose-Einstein correlations in central Pb+Pb collisions. Together with results from AGS and RHIC experiments we observe only a weak energy or no dependence of the radii over the full energy range. Microscopic (e.g. UrQMD) and hadron gas models are compared to data where possible.
K. Mitsutani
the quark neatnear T_c and
We have investigated the quasi-particle picutre of the quark near T_c in terms of the spectral function and the pole structure of the propagator. Now we study the effect of the novel spectral property found there on the dilepton production rate using a Yukawa model. In this report, we show the numerical results and its physical interpretation.N
M. Nahrgang