Delta-33 medium mass modification and pion spectra
  We study the pi+- spectra obtained in 2,4,6,8 A GeV Au-Au collisions within the thermal model. We find that the main features of the data can be well described after we include the pions from the decay of the Delta-resonance with medium mass modification. 
Bi Pin-zhen (Fudan) and Johann Rafelski (Arizona)