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Investigations have shown that the collective motion not only appears innucleus-nucleus but also in p-p collisions. The best tool for depicting suchcollective motion is relativistic hydrodynamics. In this paper, the collectivemotion is assumed obeying the hydro model which integrates the features ofLandau and Hwa-Bjorken theory and is one of a very few analytically solvablemodels. The fluid is then supposed freezing out into charged particles from atime-like hypersurface with a fixed time of t_FO . The researches of presentpaper show that this part of charged particles together with leading particles,which, by conventional definition, carry on the quantum numbers of collidingnucleons and take away the most part of incident energy, can give a properuniversal description to the pseudorapidity distributions of charged particlesmeasured in both nucleus-nucleus and p-p collisions at now available energyregions.

A universal description of pseudorapidity distributions in both nucleus-nucleus and p-p collisions at now available energy regions