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In p-p collisions, the produced charge particles consist of two leadingparticles and those frozen out from the hot and dense matter created incollisions. The two leading particles are respectively in the projectile andtarget fragmentation region, which, in this paper, are conventionally supposedto have Gaussian rapidity distributions. The hot and dense matter is assumed toexpand according to the unified hydrodynamics, a hydro model which unifies thefeatures of Landau and Hwa-Bjorken model, and freeze out into charged particlesfrom a space-like hypersurface with a fixed proper time of Tau_FO. The rapiditydistribution of this part of charged particles can be derived out analytically.The combined contribution from both leading particles and unified hydrodynamicsis then compared against the experimental data performed in a wide nowavailable center-of-mass energy region from 23.6 to 7000 GeV. The modelpredictions are in well consistent with experimental measurements.

A combined model for the pseudorapidity distributions in p-p collisions at center-of-mass energies from 23.6 to 7000 GeV