Talk given at Workshop on Flow and Strangeness Productioon in Heavy Ion Collisions from Relativistic to Ultra-relativistic Energies, at Obernai, France in September 27 - 28, 1999.

Collective Flow in Heavy Ion Collisions at CERN-SPS WA98

• WA98 Experiment
• Features of WA98 Flow Analysis
  • WA98 Collaboration
  • Plastic Ball
  • Tracking Arm
• Analysis of Plastic Ball
  • Sub-event analysis
  • Sub-event Analysis for Real & Mixed
  • Protons & Pions at Plastic Ball
  • Definitions
  • Resolution of the Reaction Plane
• Analysis of Directed Flow
  • Rapidity dependence
  • Two distinct features compared with AGS
  • Strength of directed flow
  • Plastic Ball vs RQMD
• Analysis of mid-rapidity spectrometer
  • Single particle spectra
  • Azimuthal angular correlation
  • Fourier Components
  • pt dependence
  • Beam energy dependence of Elliptic Flow
• Intuitive Model
  • Elliptic nucleon distribution
  • Results
• Summary