# Energy dependence of $\pi^0$ production in Cu+Cu collisions at $\sqrt{s_{NN}}$ = 22.4, 62.4, and 200 GeV

Abstract : Neutral pion transverse momentum (pT) spectra at mid-rapidity (|y| < 0.35) were measured in Cu+Cu collisions at \sqrt s_NN = 22.4, 62.4, and 200 GeV. Relative to pi -zero yields in p+p collisions scaled by the number of inelastic nucleon-nucleon collisions (Ncoll) at the respective energies, the pi-zero yields for pT \ge 2 GeV/c in central Cu+Cu collisions at 62.4 and 200 GeV are suppressed, 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 GeV and 200 GeV, while the enhancement at 22.4 GeV is consistent with nuclear modifications in the initial state alone.
Document type :
Journal articles
Physical Review Letters, American Physical Society, 2008, 101, pp.162301. <10.1103/PhysRevLett.101.162301>
Domain :

http://hal.in2p3.fr/in2p3-00232571
Contributor : Dominique Girod <>
Submitted on : Friday, February 1, 2008 - 10:58:56 AM
Last modification on : Friday, December 5, 2008 - 10:24:41 AM

### Citation

A. Adare, S. Afanasiev, C. Aidala, N.N. Ajitanand, Y. Akiba, et al.. Energy dependence of $\pi^0$ production in Cu+Cu collisions at $\sqrt{s_{NN}}$ = 22.4, 62.4, and 200 GeV. Physical Review Letters, American Physical Society, 2008, 101, pp.162301. <10.1103/PhysRevLett.101.162301>. <in2p3-00232571>

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