High pT at lower energies: Cronin enhancement

• Increased high-pT production in pA, AA collisions: RAB >1

• Initial-state multiple (soft & semi-hard) parton

• interactions (before hard scattering): kT broadening

• [additional to intrinsic proton kT2~2.0 GeV 2 ]

• Exactly the opposite trend is observed at RHIC !

Notes: