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High pT hadron spectra (central vs. periph.)
Jet physics in HI collisions º High-pT hadron physics:
Traditional jet algorithms fail in HI collisions below pT ~ 40 GeV/c (at ÖsNN = 200 GeV) due to large soft background.
High transv. mom. hadrons (pT>2 GeV/c) º products of parton fragmentation ("leading particle")
Au+Au h± and p0, |h|<0.35, compared to scaled pp reference (pT>1.0 GeV/c):
- Interpolation ISR, UA1, CDF p+p,p
4 Peripheral collisions well described
6 Central colls. not described
(´2-3 suppression)
- ~30-50% systematic errors:
~ 20-35% : pp interpolation
~ 16-30% : data
~ 11%: Ncoll scaling