Unified thermal freeze-out model and its parameters at RHIC

Bhat, Riyaz Ahmed; Uddin, Saeed; Bashir, Inam-ul

doi:10.1016/j.nuclphysa.2015.01.002

Cited by 9 publications

(5 citation statements)

References 14 publications

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“…Some statistical thermal models have successfully described the particle abundances at low p T . [14] It has been shown earlier [8,15] that our model can simultaneously explain the rapidity and transverse momentum distributions of hadrons in Au-Au collisions at RHIC energies. Also we have employed this model to successfully reproduce the transverse momentum distributions of hadrons produced in the central Pb -Pb collisions at √ s N N = 2.76 TeV at the LHC.…”

Section: Introductionmentioning

confidence: 69%

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Centrality Dependence of ${{\boldsymbol{K}}}^{* }{(892)}^{0}$ and ϕ (1020) Production at LHC

Bashir¹,

Uddin²

2017

Commun. Theor. Phys.

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We study the centrality dependence of the mid-rapidity (|y| < 0.5) yields and transverse momentum distributions of K * (892) 0 and ϕ(1020) resonances produced in Pb + Pb collisions at √ sNN = 2.76 TeV. The midrapidity density (dN/dy) and the shape of the transverse momentum spectra are well reproduced by an earlier proposed Unified Statistical Thermal Freeze-out Model (USTFM), which incorporates the effects of both longitudinal as well as transverse hydrodynamic flow. The freeze-out properties in terms of kinetic freeze-out temperature and transverse flow velocity parameter are extracted from the model fits to the transverse momentum data provided by the ALICE experiment at the LHC. The kinetic freeze-out temperature is found to increase with decreasing event centrality while the transverse flow velocity parameter shows a mild decrease on moving towards peripheral collisions. Moreover the centrality dependence of the mid-rapidity system size at freeze-out has also been studied in terms of transverse radius parameter.

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Section: Introductionmentioning

confidence: 69%

“…The collective flow is found to be stronger at LHC than at RHIC. [8] This is because of the large amount of energy available for the particle production at LHC than at RHIC. The K * (892) 0 and ϕ(1020), with similar mass to that of a proton, have a significant value of collective flow, which is consistent with that of proton.…”

Section: Resultsmentioning

confidence: 99%

Centrality Dependence of ${{\boldsymbol{K}}}^{* }{(892)}^{0}$ and ϕ (1020) Production at LHC

Bashir¹,

Uddin²

2017

Commun. Theor. Phys.

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“…The baryon-rich fireballs are expected to maintain large chemical potentials which will vary with the degree of stopping in the given experiment. Variation in system's temperature will also be observed depending on the collision scenario, including system size [27,28].…”

Section: Resultsmentioning

confidence: 99%

“…The HRG system continues to grow, expand, and cool and in the process gets diluted. After this, a freeze-out occurs when the mean free paths of these particles become comparable with the overall size of the system [25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Particle Ratios in a Multicomponent Nonideal Hadron Resonance Gas

Parra

Uddin

Bashir³

et al. 2023

Advances in High Energy Physics

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We have considered formation of a multicomponent nonideal hot and dense gas of hadronic resonances in the ultrarelativistic heavy ion collisions. In the statistical thermal model approach, the equation of state (EoS) of the noninteracting ideal hadron resonance gas (IHRG) does not incorporate either the attractive part or the short-range repulsive part of the baryonic interaction. On the other hand, in the nonideal hadron resonance gas (NIHRG) model, we can incorporate these interactions using the van der Waals (VDW) type approach. Studies have been made to see its effect on the critical parameters of the quark-hadron phase transition. However, it can also lead to modifications in the calculated relative particle yields. In this paper, we have attempted to understand the effect of such van der Waals-type interactions on the relative particle yields and also studied their dependences on the system’s thermal parameters, such as the temperature and baryon chemical potential μ B . We have also taken into account the decay contributions of the heavier resonances. These results on particle ratios are compared with the corresponding results obtained from the point-like, i.e., noninteracting IHRG model. It is found that the particle ratios get modified by incorporating the van der Waals-type interactions, especially in a baryon-rich system which is expected to be formed at lower RHIC energies, SPS energies, and in the forthcoming CBM experiments due to high degree of nuclear stopping in these experiments.

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“…Also R represents the transverse size of the system at mid-rapidity (z = 0). In our earlier works [6,7,11], we have incorporated the contribution from heavier decay resonances while reproducing the various particle distributions. In contrast to this, in the present work, we have neglected the effects of heavier resonance decays.…”

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confidence: 99%

Centrality and system size dependence of φ meson production at RHIC

Bashir

Uddin

2017

EPL

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We study the centrality and system size dependence of φ meson production by reproducing its transverse-momentum distributions and mid-rapidity distributions (dN/dy) for various collision systems of Au+Au, Cu+Cu, d+Au and p+p at various RHIC energies of , 130 GeV and 200 GeV by using Unified Statistical Thermal Freeze-out Model (USTFM). The calculated results are found to be in good agreement with the experimental data points taken from the STAR experiment. Freeze-out conditions in terms of transverse flow velocity and thermal freeze-out temperature are extracted from the fits of transverse-momentum spectra of the particles at different centrality classes and for different collision systems. The transverse size of the system in terms of transverse-radius parameter is determined from the fits of rapidity distributions at various centrality classes and for various collision systems.

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Unified thermal freeze-out model and its parameters at RHIC

Cited by 9 publications

References 14 publications

Centrality Dependence of ${{\boldsymbol{K}}}^{* }{(892)}^{0}$ and ϕ (1020) Production at LHC

Centrality Dependence of ${{\boldsymbol{K}}}^{* }{(892)}^{0}$ and ϕ (1020) Production at LHC

Particle Ratios in a Multicomponent Nonideal Hadron Resonance Gas

Centrality and system size dependence of φ meson production at RHIC

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