We present results for inclusive π0 production in proton-proton and in Au-Au at RHIC energy √s = 200 GeV. We use next-to-leading order perturbative QCD calculation and we include nuclear effects such as parton energy loss and nuclear shadowing. We consider the ratio of π0 distribution in Au-Au and p-p collisions for pT > 3 GeV for three cases of parton energy loss: (1) constant parton energy loss per parton scattering, εna = const, (2) Landau-Pomeranchuk-Migdal energy-dependent energy loss, εna ∼ √Ena and (3) Bethe-Heitler energy-dependent energy loss, εna ∼ Ena. We show that recently observed suppression of π0 production in Au-Au collisions at RHIC, which is found to increase with pT increasing from 3 GeV to 8 GeV, can be reproduced by εna = 0.06Ena. We show that the ratio of prompt photons to neutral pions produced in Au-Au collisions at RHIC has a strong pT dependence approaching one at pT ∼ 10 GeV.
|Original language||English (US)|
|Number of pages||6|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|State||Published - Jun 5 2003|
ASJC Scopus subject areas
- Nuclear and High Energy Physics