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Foreword: central rapidity densities in Au+Au
dNch/dy constraints mechanisms of initial multi-particle production:
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dNch/dy (per participant pair) increases faster than linearly with Npart :
Global particle density at y=0 well described by pQCD- & CGC- based models:
"Soft + hard" (string + pQCD “minijet”): increased hard contribution (Ncoll )
Initial-state gluon saturation (CGC): dNch/dy ~ dNgluon/dy ~ 1/as ~ Npartln(Npart )
Notes: