First results from PHENIX (II) Particle Multiplicity PRL 86, 3500 (2001)
Soft (A) and hard (B) components in particle production:
ZDC+BBC gives Ncollisions and Nparticipants (via Glauber geom. model)
Pad Chambers measure dN/dy
Evidence for term ~ # binary inelastic collisions. Hard processes increase with centrality (30% mid-central to ~50% most central)
dET/dh shows same centrality dependence. (<ET >/<Nch> ~ const)