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High pT @ RHIC: Summary (I)
Large amount of high quality data after 2 years of RHIC:
Results globally consistent within errors among the 4 experiments.
Central AuAu collisions:
- Strong suppression (factor ~5) of p0 with respect to Ncoll scaling.
- Suppression (factor ~3.5) of unidentified charged hadrons.
- No apparent suppression of (anti)protons up to ~4 GeV/c (“anomalous” p/p).
- Approx. Npart scaling of hadrons above ~5 GeV/c.
- Magnitude of suppression in agreement with parton energy loss scenarios assuming opaque medium formation (dNg/dy~900, l/L~3-4).
- Flat pT dependence (so far) of suppression not described with LPM energy loss alone.
Peripheral AuAu collisions:
- Behave effectively as pp collisions (i.e. as pQCD predicts) for all species.
Suppression sets in over 40-70% centrality class (Npart ~ 50).
Relative increase of high pT yields (130 to 200 GeV) in agreement with pQCD: particle production from (mini)jets.
Notes: