Unified Hydrodynamics and Pseudorapidity Distributions of Charged Particles Produced in Heavy Ion Collisions at Low Energies at RHIC

  • In the context of unified hydrodynamics, we discuss the pseudorapidity distributions of the charged particles produced in Au-Au and Cu-Cu collisions at the low RHIC energies of \sqrt s_\rm NN=19.6 and 22.4 GeV, respectively. It is found that the unified hydrodynamics alone can give a good description to the experimental measurements. This is different from the collisions at the maximum RHIC energy of \sqrt s_\rm NN=200 GeV or at LHC energy of \sqrt s_\rm NN=2.76 TeV, in which the leading particles must be taken into account so that we can properly explain the experimental observations.
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