High pT suppression: system-size dependence

• Smaller CuCu system adds significant precision at intermediate Npart~100:

• Theory predicts: ln(RAA) µNpart-2/3

• Both PHENIX & STAR preliminary data seem to exclude = -2/3

• Fit to STAR Npart prefers “shallower” ~ -1/3 (circumf./area ~ A-1/3 ~ Npart-1/3 ?)

• PHENIX data seems to indicate a “steeper” slope at low Npart.

• Differences STAR  PHENIX and PQM  GLV still unclear at this point.