qu'avons nous appris ?

• PHENIX global results :

• Very high energy densities (~70% larger than at SPS) >> expected

• critical value for QGP.

• Large particle production, rising faster than number of participant

• nucleons (onset of hard processes and/or saturation physics).

• Much closer to baryon-free central region than at SPS.

• PHENIX high-pT results :

• High-pT h± and 0 spectra central collisions: factor 4-5 suppression

• (qualitative agreement with energy loss in opaque medium).

• Increased baryon over meson yield above pT ~ 2 GeV/c (very different

• from pp data). p,pbar not suppressed up to ~4.5 GeV/c.

• Strong elliptic flow signal (early collective rescattering).

• Jet-like signal in azimuthal near-side correlations. Suppression of away-side.

• Cronin-enhancement in d+Au → Au+Au suppression not due to initial-state

• PHENIX heavy-flavor results :

• Single electron consistent with pp scaled open charm: no medium effect.

• Strong enhancement of charmonium ruled out. Suppression studies need

• high luminosity run.

Notes: