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The charged particles produced in nucleus-nucleus collisions come fromleading particles and those frozen out from the hot and dense matter created incollisions. The leading particles are conventionally supposed having Gaussianrapidity distributions normalized to the number of participants. The hot anddense matter is assumed to expand according to the unified hydrodynamics, ahydro model which unifies the features of Landau and Hwa-Bjorken model, andfreeze out into charged particles from a space-like hypersurface with a propertime of Tau_FO . The rapidity distribution of this part of charged particlescan be derived out analytically. The combined contribution from both leadingparticles and unified hydrodynamics is then compared against the experimentaldata performed by BNL-RHIC-PHOBOS Collaboration in different centrality Cu-Cucollisions at sqrt(s_NN)=200 and 62.4 GeV, respectively. The model predictionsare in well consistent with experimental measurements.

A combined model for pseudorapidity distributions in Cu-Cu collisions at BNL-RHIC energies