Hadron composition at high-pT

• Baryon (p, p) yield larger than pion

• yield for pT>2 GeV/c (central colls.)

• High-pT baryon/meson ratio~0.3 in

• p+p,p collisions (ISR,FNAL)

• Supports conclusion of enhanced

• suppression of pions

• Different interpretations proposed:

  • Hydro (strong collective radial flow) + hadron rescattering
  • "Exotic" mechanisms: Baryon junctions + jet quenching in pion channel
  • Color-Glass-condensate explains also the observed mT-scaling ...