Alternative scenarios of relativistic heavy-ion collisions. III. Transverse momentum spectra

作者：Ivanov Yu B^*

来源：Physical Review C, 2014, 89(2): 024903.

DOI：10.1103/PhysRevC.89.024903

Transverse-mass spectra, their inverse slopes, and mean transverse masses in relativistic collisions of heavy nuclei are analyzed in a wide range of incident energies, 2.7 GeV <= root(NN)-N-s <= 39 GeV. The analysis is performed within the three-fluid model, employing three different equations of state (EoS): a purely hadronic EoS, an EoS with the first-order phase transition, and an EoS with a smooth crossover transition into deconfined state. Calculations show that inverse slopes and mean transverse masses of all the species (with the exception of antibaryons within the hadronic scenario) exhibit steplike behavior similar to that observed for mesons and protons in available experimental data. This steplike behavior takes place for all considered EoSs and results from the freeze-out dynamics rather than being a signal of the deconfinement transition. A good reproduction of experimental inverse slopes and mean transverse masses for light species (up to protons) is achieved within all the considered scenarios. The freeze-out parameters are precisely the same as those used for reproduction of particle yields in previous papers of this series. This became possible because the freeze-out stage is not completely equilibrium.

• 出版日期2014-2-6