Fluid properties of hadron gas produced in relativistic hadronic and heavy-ion collisions
R. Scaria*,
D. Sahu,
C.R. Singh,
R. Sahoo and
J.e. Alam*: corresponding author
Pre-published on:
March 27, 2023
Published on:
June 21, 2023
Abstract
Thermalization is a vital feature that enables the study of hydrodynamic evolution of the medium produced in nuclear collisions at relativistic energies. Here, we obtain the variation of Knudsen number ($Kn$) to study the degree of thermalization in an excluded volume hadron resonance gas model. $Kn$ along with other parameters like Reynolds number ($Re$) and Mach number ($Ma$) give insights into the nature of the flow in a system. The dependence of these dimensionless parameters on system size and baryonic chemical potential ($\mu_B$) are studied. The obtained values of the parameters ($Kn << 1$, $Ma \sim 1$ and $Re >> 1$) indicate the occurrence of compressible inviscid flows at high temperatures close to the QCD phase transition region ($T \sim150 -170$ MeV). The degree of thermalization of hadron gas estimated is comparable over different system sizes, indicating the applicability of hydrodynamics in interpreting the results from high multiplicity pp to heavy-ion collisions.
DOI: https://doi.org/10.22323/1.422.0332
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