Pseudorapidity Distribution of Charged Particles and Square Speed of Sound Parameter in p-p or p-p- Collisions over an Energy Range from 0.053 to 7 TeV

Abstract EN

Pseudorapidity distributions of charged particles produced in proton-proton (p-p) or proton-antiproton (p-p-) collisions over an energy range from 0.053 to 7 TeV are studied by using the four-component Landau hydrodynamic model.

The results calculated by the model are in agreement with the experimental data of the UA5, PHOBOS, UA1, P238, CDF, ALICE, and CMS Collaborations which present orderly from low to high energies.

According to the distribution widths of different components, the values and some features of square speed of sound parameter cs2 for “participant” and “spectator” quark components are obtained.

It is shown that the speed of sound for “participant” quark components agrees approximately with that for “spectator” quark components in the error ranges.

The present work is useful for studying nucleus-nucleus collisions in the related energy range.