Onset of {pi}{sup 0} Suppression Studied in Cu+Cu Collisions at {radical}(s{sub NN})=22.4, 62.4, and 200 GeV
- University of Colorado, Boulder, Colorado 80309 (United States)
- Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region (Russian Federation)
- Columbia University, New York, New York 10027, USA and Nevis Laboratories, Irvington, New York 10533 (United States)
- Chemistry Department, Stony Brook University, SUNY, Stony Brook, New York 11794-3400 (United States)
Neutral pion transverse momentum (p{sub T}) spectra at midrapidity (|y| < or approx. 0.35) were measured in Cu+Cu collisions at {radical}(s{sub NN})=22.4, 62.4, and 200 GeV. Relative to {pi}{sup 0} yields in p+p collisions scaled by the number of inelastic nucleon-nucleon collisions (N{sub coll}) the {pi}{sup 0} yields for p{sub T}(> or approx. 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.
- OSTI ID:
- 21179812
- Journal Information:
- Physical Review Letters, Vol. 101, Issue 16; Other Information: DOI: 10.1103/PhysRevLett.101.162301; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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