Campus Units

Physics and Astronomy

Document Type

Article

Publication Version

Published Version

Publication Date

10-2008

Journal or Book Title

Physical Review Letters

Volume

101

Issue

16

First Page

162301

DOI

10.1103/PhysRevLett.101.162301

Abstract

Neutral pion transverse momentum (p(T)) spectra at midrapidity (|y| less than or similar to 0.35) were measured in Cu + Cu collisions at root s(NN) = 22.4, 62.4, and 200 GeV. Relative to pi(0) yields in p + p collisions scaled by the number of inelastic nucleon-nucleon collisions (N-coll) the pi(0) yields for p(T) greater than or similar to 2 GeV/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.

Comments

This article is published as Adare, A., S. Afanasiev, C. Aidala, N. N. Ajitanand, Y. Akiba, H. Al-Bataineh, J. Alexander et al. "Onset of π 0 Suppression Studied in Cu+ Cu Collisions at s N N= 22.4, 62.4, and 200 GeV." Physical review letters 101, no. 16 (2008): 162301. DOI:10.1103/PhysRevLett.101.162301. Posted with permission.

Copyright Owner

American Physical Society

Language

en

File Format

application/pdf

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