Abstract
Neutral pion transverse momentum () spectra at midrapidity () were measured in collisions at , 62.4, and 200 GeV. Relative to yields in collisions scaled by the number of inelastic nucleon-nucleon collisions () the yields for in central 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 collisions at 62.4 and 200 GeV, while the enhancement at 22.4 GeV is consistent with nuclear modifications in the initial state alone.
- Received 30 January 2008
DOI:https://doi.org/10.1103/PhysRevLett.101.162301
©2008 American Physical Society