  A systematic study of particle production at large transverse momentum with
the PHENIX experiment at RHIC is shown. We demonstrate that the suppression of
the yield of high p_T hadrons in central Au+Au collisions compared to the
scaled p+p reference persists up to highest p_T for neutral pions and eta
mesons. A similar suppression pattern is also observed in Cu+Cu collisions at
the same energy. In addition we present the first RHIC results on high-p_T
particle production close to SPS energies.
