Transport coefficients of a unitarized pion gas

TL;DR

This paper reviews the calculation of transport coefficients in a low-temperature pion gas using effective chiral theory, and investigates heavy quark diffusion in this medium relevant to heavy-ion collision experiments.

Contribution

It provides a theoretical framework for computing transport coefficients in a unitarized pion gas and extends the analysis to heavy quark diffusion within this system.

Findings

Transport coefficients are computed for a low-energy pion gas.

Heavy quark diffusion coefficients are extracted from meson propagation.

Theoretical results are relevant for understanding collective properties in heavy-ion collisions.

Abstract

The latest experimental results in relativistic heavy-ion collisions show that the matter there produced requires transport coefficients because of the important collective properties found. We review the theoretical calculation of these transport coefficients in the hadron side at low temperatures by computing them in a gas composed of low energy pions. The interaction of these pions is taken from an effective chiral theory and further requiring scattering unitarity. The propagation of D and D* mesons in the thermalized pion gas is also studied in order to extract the heavy quark diffusion coefficients in the system.