Onset of π0 suppression studied in Cu+Cu collisions at sNN=22.4, 62.4, and 200 GeV

PHENIX Collaboration

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87 Scopus citations

Abstract

Neutral pion transverse momentum (pT) spectra at midrapidity (|y|□0.35) were measured in Cu+Cu collisions at sNN=22.4, 62.4, and 200 GeV. Relative to π0 yields in p+p collisions scaled by the number of inelastic nucleon-nucleon collisions (Ncoll) the π0 yields for pT □2GeV/c in central Cu+Cu collisions are suppressed at 62.4 and 200 GeV whereas an enhancement is observed at 22.4 GeV. A comparison with a jet-quenching model suggests that final state parton energy loss dominates in central Cu+Cu collisions at 62.4 and 200 GeV, while the enhancement at 22.4 GeV is consistent with nuclear modifications in the initial state alone.

Original languageEnglish
Article number162301
JournalPhysical Review Letters
Volume101
Issue number16
DOIs
StatePublished - 15 Oct 2008
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy

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