High pT @ CERN-SPS: “Cronin” or “quenching” ?

• New nuclear modification factor (better p+p → π0 ref. @ √sNN = 17.3 GeV)

• [D.d'E. to be submitted]

• No “Cronin” effect in central collisions (RAA ~ 1).

• “Cronin” enhancement in peripheral ... and suppression in top central ?

• Look for onset of suppression at RHIC Au+Au, p+p @ √sNN≈ 20 GeV ?