Collective effects in central heavy-ion collisions

TL;DR

This paper investigates how in-medium effects influence the transverse-mass distributions of quarks and gluons in central heavy-ion collisions, showing energy-dependent saturation behavior consistent with experimental observations.

Contribution

It introduces a model considering local equilibrium of colorless quark objects and demonstrates its ability to reproduce observed energy dependence of hadron spectra.

Findings

Average transverse momentum squared saturates at high energies.

Model reproduces the energy dependence of hadron transverse mass spectra.

Comparison with other scenarios highlights the model's effectiveness.

Abstract

In-medium effects on transverse-mass distributions of quarks and gluons are considered assuming a possible local equilibrium for colorless quark objects (mesons and baryons) created in central A-A collisions. It is shown that the average transverse momentum squared for these partons grows and then saturates when the initial energy increases. Within the quark-gluon string model it leads to the colliding energy dependence of hadron transverse mass spectra which is similar to that observed in heavy ion collisions. Comparison with other scenarios is given.