Hydrodynamic description of pseudorapidity distributions of charged particles in p-p collisions at center-of-mass energies from 23.6 GeV to 7 TeV

The investigations have shown that the hot and dense matter created in p-p collisions at high energies have the similar collective motion as that formed in nucleus-nucleus collisions. The best tool for describing collective motion is relativistic hydrodynamics. In this paper, in the framework of the combined model of unified hydrodynamics + leading particles, we discuss the pseudorapidity distributions of charged particles produced in p-p collisions. The rapidity distributions of charged particles frozen out from the fluid expanding according to unified hydrodynamics can be worked out exactly. The rapidity distributions of leading particles are assumed possessing the Gaussian form. It can be seen that the theoretical model works well for p-p collisions in the whole available energy region from 23.6 to 7000 GeV.