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Antiparticle to particle ratios for identified protons, kaons and pions atsqrt(s) = 62.4 and 200 GeV in Cu+Cu collisions are presented as a function ofcentrality for the midrapidity region of 0.2 < eta < 1.4. No strong dependenceon centrality is observed. For the <pbar>/<p> ratio at <p_T> ~ 0.51 GeV/c, weobserve an average value of 0.50 +/- 0.003_(stat) +/- 0.04_(syst) and 0.77 +/-0.008_(stat) +/- 0.05_(syst) for the 10% most central collisions of 62.4 and200 GeV Cu+Cu, respectively. The values for all three particle species measuredat sqrt(s) = 200 GeV are in agreement within systematic uncertainties with thatseen in both heavier and lighter systems measured at the same RHIC energy. Thisindicates that system size does not appear to play a strong role in determiningthe midrapidity chemical freeze-out properties affecting the antiparticle toparticle ratios of the three most abundant particle species produced in thesecollisions.

Identified charged antiparticle to particle ratios near midrapidity in Cu+Cu collisions at sqrt(s) = 62.4 and 200 GeV