A study of the Landau hydrodynamical model predictions for high-energy inclusive charged particle production

Abstract

The predictions of the Landau hydrodynamical model are compared with the experimental results on the one-particle distributions from proton-proton collisions at the CERN ISR. Both one-dimensional and three-dimensional versions of the model are considered. The parameters of the model are the velocity of sound in nuclear matter, c 0, which describes the expansion and cooling of the fluid, and the break-up temperature, T c, at which the particles emerge. The best agreement between the theoretical and experimental distributions is obtained for values of these parameters well below those from earlier investigations. The values are, however, compatible to those found in proton-nucleus investigations. The values of best agreement do, however, for the one-dimensional model, depend upon the range of phase space where the comparison is made. For the three-dimensional model, the parameter values are less sensitive to the range considered.