Freeze-out volume of hot dense fireball

Mishra, M.; Singh, C. P.

doi:10.1016/j.physletb.2007.06.014

Cited by 10 publications

(6 citation statements)

References 31 publications

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“…Moreover, at GSI-SIS and BNL-AGS energies, the freeze-out parameters involve a much larger values of baryon chemical potentials and the predictions of all the excluded-volume models are quite different from those obtained in the ideal gas models. We have already shown the utility of the present model in explaining various properties of hot, dense hadron gas [11,12]. The analysis presented here lends further support to our claim that the excluded-volume model obtained by us properly explain the multiplicities and particle ratios of various particles after chemical freeze-out.…”

Section: Discussionsupporting

confidence: 86%

“…Recently we have given a model based on the geometrical excluded volume correction which describes suitably the thermodynamical quantities of a hot and dense HG [11]. We have further used this prescription to determine the freeze-out volume of the fireball as well as pions and nucleon density [12]. We find that the densities are reproduced well by their HBT experimental data.…”

Section: Introductionmentioning

confidence: 75%

“…In this paper we attempt to explain the experimental data on strange particle multiplicities, particle ratios in the HG scenario using our excluded volume model discussed in [11,12]. Since many attempts [13] have been made by various authors to explain particle multiplicities using different HG models [14,15,16,17,18], it will be worthwhile to compare chemical freeze-out parameters (i.e., T, µ B ) of the fireball as determined in these models.…”

Section: Introductionmentioning

confidence: 99%

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Particle multiplicities and ratios in excluded volume models

Mishra

Singh

2008

Phys. Rev. C

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One of the most surprising results is to find that a consistent description of all the experimental results on particle multiplicities and particle ratios obtained from the lowest AGS to the highest RHIC energies is possible within the framework of a thermal statistical model. We propose here a thermodynamically consistent excluded-volume model involving an interacting multi-component hadron gas. We find that the energy dependence of the total multiplicities of strange and non-strange hadrons obtained in this model agrees closely with the experimental results. It indicates that the freeze out volume of the fireball is uniformly the same for all the particles. We have also compared the variation of the particle ratios such as K + / π + , K − / π − , K − /K + ,p/p,Λ/Λ,Ξ/Ξ,Ω/Ω, Λ / π , Ξ − / π , Ω +Ω / π and Φ / π with respect to the center-of-mass energy as predicted by our model with the recent experimental data.

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Section: Discussionsupporting

confidence: 86%

Section: Introductionmentioning

confidence: 75%

Section: Introductionmentioning

confidence: 99%

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Particle multiplicities and ratios in excluded volume models

Mishra

Singh

2008

Phys. Rev. C

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“…It is also encouraging to see that its predictions on various quantities are completely in agreement with those given by a simulation model [14] involving microscopic details of the collision geometry and the multiple scattering algorithm. We have also found that our model predicts meson and baryon densities in excellent agreement [15] with the data obtained from the analysis of the pion interferometry (HBT) [16]. In this paper we have evaluated the fireball volume at chemical freeze-out and the extremely large value of the fireball volume indicates the existence of a mixed phase between the QGP to HG phase transition [15].…”

Section: Introductionsupporting

confidence: 75%

“…We have also found that our model predicts meson and baryon densities in excellent agreement [15] with the data obtained from the analysis of the pion interferometry (HBT) [16]. In this paper we have evaluated the fireball volume at chemical freeze-out and the extremely large value of the fireball volume indicates the existence of a mixed phase between the QGP to HG phase transition [15]. These results make it amply clear that our excluded volume model can provide a reasonable description of the EOS of HG produced in the heavy-ion collisions from the lowest SIS to the highest RHIC energy.…”

Section: Introductionsupporting

confidence: 69%

On the chemical freeze-out criteria in a hot and dense fireball

Mishra¹,

Singh²

2007

Preprint

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Intensive investigations of freeze-out criteria in a hot and dense fireball provide important information regarding particle emission from the fireball. A systematic comparison of these proposals is presented here in the framework of a thermodynamically consistent excluded volume model which has been found to describe the properties of hadron gas (HG) quite well. We find that the impact of excluded volume correction is considerably large and the average energy per hadron is 0.9 GeV, n b +nb stays nearly constant at 0.12/fm 3 and the normalized entropy density s/T 3 ≈ 6 in this model. Moreover, these values are independent of the beam or center-of-mass energy and also of the target and beam nuclei. In ideal HG model these quantities show substantial energy dependence. Further we have compared the predictions of various excluded volume models in the precise determination of these criteria and we find that the thermodynamically consistent excluded volume models give the best results. In addition, we find another important criterion that entropy per hadron has a constant value at 6 in our model. We hope that these findings will throw considerable light on the expansion dynamics and the bulk thermodynamic properties of the fireball before chemical freeze-out.

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The effect of flow on hadronic spectra in an excluded-volume model

Tiwari¹,

Srivastava²,

Singh³

2013

J. Phys. G: Nucl. Part. Phys.

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Recently, we proposed a thermodynamically consistent excluded-volume model for the HG fireball and we noticed that our model gives a suitable description for various properties of multiparticle production and their ratios in the entire range of temperatures and baryon densities. 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 ( √ s N N ) and confront our model calculations with the corresponding thermal freeze-out volume obtained from the Hanbury-Brown-Twiss (HBT) pion interferometry method. We also test the validity of our model in extracting the total multiplicities as well as the central rapidity densities of various hadrons and comparing them with the recent results. We further calculate the rapidity as well as transverse momentum spectra of various particles produced in different heavy-ion collider experiments in order to examine the role of flow by matching our predictions suitably with the available experimental results. Finally, we extend our analysis for the production of light nuclei, hypernuclei and their antinuclei over a broad energy range from Alternating Gradient Synchrotron (AGS) to Large Hadron Collider (LHC) energies.

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Freeze-out volume of hot dense fireball

Cited by 10 publications

References 31 publications

Particle multiplicities and ratios in excluded volume models

Particle multiplicities and ratios in excluded volume models

On the chemical freeze-out criteria in a hot and dense fireball

The effect of flow on hadronic spectra in an excluded-volume model

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