Thermalization component model of multiplicity distributions of charged hadrons measured at BNL (ENNlab=2−11.6GeV), at CERN (ENNlab=20−200GeV), and at BNL (sNN=19.6−200GeV)

Abstract

We find that a collective flow model can successfully be used to analyze charged particle distributions at AGS and lower SPS (${E}_{\mathit{NN}}^{\mathrm{lab}}$ less than 20 GeV in the laboratory frame) but fails at RHIC. The tail of the distribution of charged particles at RHIC has a jump from the collective flow model calculation as the energy increases. In this paper a thermalization component model is presented based on collective flow to study the multiplicity distributions at RHIC. It is realized that the region of phase space of collective flow can reflect that of the thermalization region. By comparing the contributions of particle production from the thermalization region at different energies and different centralities, we can deepen our study on collective movement at RHIC.