Excitation Functions of Related Parameters from Transverse Momentum (Mass)‎ Spectra in High-Energy Collisions

Abstract EN

Transverse momentum (mass) spectra of positively and negatively charged pions and of positively and negatively charged kaons, protons, and antiprotons produced at mid-(pseudo)rapidity in various collisions at high energies are analyzed in this work.

The experimental data measured in central gold-gold, central lead-lead, and inelastic proton-proton collisions by several international collaborations are studied.

The (two-component) standard distribution is used to fit the data and extract the excitation function of effective temperature.

Then, the excitation functions of kinetic freeze-out temperature, transverse flow velocity, and initial temperature are obtained.

In the considered collisions, the four parameters increase with the increase of collision energy in general, and the kinetic freeze-out temperature appears at the trend of saturation at the top Relativistic Heavy Ion Collider and the Large Hadron Collider.