Hadron composition at high-pT (2): p/p ratio

Pronounced centrality dependence of p/p ratio.
Central colls.: baryon/meson ~ 0.8 for pT > 2 GeV/c at variance with perturbative production mechanisms (favour lightest meson).
Periph. colls. baryon/meson ~ 0.3 as in p+p,pbar (ISR,FNAL) and in e+e- jet fragmentation

Pronounced centrality dependence of p/p ratio.