The origin of large-pT π0 suppression at RHIC

Sangyong Jeon, Jamail Jalilian-Marian, Ina Sarcevic

Research output: Contribution to journalArticlepeer-review

45 Scopus citations


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 languageEnglish (US)
Pages (from-to)45-50
Number of pages6
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number1-2
StatePublished - Jun 5 2003

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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