  We present the incident energy and system size dependence of the pT spectra
for charged pions, protons, and anti-protons using Au+Au and Cu+Cu collisions
at Sqrt(sNN) = 62.4 and 200 GeV in STAR experiment at RHIC. Through these
measurements in the pT range of 0.2 < pT < 10 GeV/c we conduct a systematic
study of the beam energy, system size and particle species dependence of
nuclear modification factors and address specific predictions from the quark
coalescence models regarding the beam energy dependence of baryon enhancement
in the intermediate pT (2 < pT < 6 GeV/c) region.
