Transverse momentum distributions of final-state particles produced in AA, p(d)A, and pp collisions at high energies

摘要

In the framework of the cylinder model-the transverse momentum distributions of final-state particles produced in nucleus-nucleus (AA), proton(deuteron)-nucleus [p(d)A], and proton-proton (pp) collisions at high energies are investigated by a semi-empirical two-component distribution. In the region closing the side-surface of the cylinder, the local source stays in a low excitation state; and in the region closing the central axis of the cylinder, the local source stays in a high excitation state. The calculated results are in agreement with the experimental data of Cu-Cu collisions at root s(NN) = 22.5 GeV measured by the PHENIX Collaboration, p-Pb collisions at 400 GeV measured by the NA50 Collaboration, d-Au collisions at root s(NN) = 200 GeV measured by the PHENIX Collaboration, and pp collisions at root s = 200 GeV measured by the PHENIX and BRAHMS Collaborations. (C) 2008 Elsevier B.V. All rights reserved.