Identified charged antiparticle to particle ratios near midrapidity in Cu+Cu collisions at {radical}(s{sub NN})=62.4 and 200 GeV

Antiparticle to particle ratios for identified protons, kaons, and pions at {radical}(s{sub NN})=62.4 and 200 GeV in Cu+Cu collisions are presented as a function of centrality for the midrapidity region of 0.2 / ratio at {approx_equal}0.51 GeV/c, we observe an average value of 0.50{+-}0.003{sub (stat)}{+-}0.04{sub (syst)} and 0.77{+-}0.008{sub (stat)}{+-}0.05{sub (syst)} for the 10% most central collisions of 62.4 and 200 GeV Cu+Cu, respectively. The values for all three particle species measured at {radical}(s{sub NN})=200 GeV are in agreement within systematic uncertainties with that seen in both heavier and lighter systems measured at the same RHIC energy. This indicates that system size does not appear to play a strong role in determining the midrapidity chemical freeze-out properties affecting the antiparticle to particle ratios of the three most abundant particle species produced in these collisions.