Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2012-02-22
Physics
High Energy Physics
High Energy Physics - Phenomenology
29 pages, 20 figures
Scientific paper
Remarkable success gained by various thermal and statistical approaches in describing the particle multiplicities and their ratios has emphasized the formation of a fireball consisting of chemically equilibrated hot and dense hadron gas (HG) produced in the ultrarelativistic heavy-ion collisions. In an earlier paper referred as I, we proposed a thermodynamically consistent excluded-volume model for the HG fireball and we noticed that the model gives a suitable description for various properties of multiparticle production and their ratios in the entire range of temperatures and baryon densities. Furthermore, a numerical calculation indicates that the model respects causality and the values of the transport coefficients (such as shear viscosity to entropy ($\eta/s$) ratio, and the speed of sound etc.) suitably match with the predictions of other HG models. The aim in this paper is to obtain the variations of freeze-out volume in a slice of unit rapidity i.e. $dV/dy$ as well as total volume of the fireball with respect to center-of-mass energy $(\sqrt{S_{NN}})$ and confront our model calculations with the corresponding thermal freeze-out volume obtained from the Hanbury-Brown-Twiss (HBT) pion interferometry. We also test the validity of our model in extracting the total multiplicities as well as the central rapidity densities of various hadrons such as $\pi^+$, $K^+$, $p$, $\phi$, $\Lambda$, $\Xi^-$, $\Omega^{-}$, $\bar{\Lambda}$ etc. and in getting the rapidity as well as transverse momentum distributions of various particles produced in different heavy-ion collider experiments in order to examine the role of any hydrodynamic flow on them by matching our predictions with the experimental results.
Singh Chandra Prakash
Srivastava Prashant Kumar
Tiwari Sanat Kumar
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