Systematic of particle thermal freeze-out in a hadronic fireball at RHIC

Uddin, Saeed; Bhat, Riyaz Ahmed; Bashir, Inam-ul; Bashir, Waseem; Ahmad, Jan Shabir

doi:10.1016/j.nuclphysa.2014.11.010

Cited by 17 publications

(23 citation statements)

References 18 publications

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“…Since no information transfer between inside and outside of the black hole is allowed, the Hawking-Unruh radiation must have a priori equal weights in all possible states of the black hole outside. It was concluded that the process at the stage of formation is thermal [10]. From the pair production at the event horizon, the color neutrality (confinement) and the instability of the physical vacuum (to which the radiation is imported) allows transition through quantum tunneling and leads to the thermal radiation at the Hawking-Unruh temperature (T HU ) [11].…”

Section: Introductionmentioning

confidence: 99%

Chemical freeze-out in Hawking-Unruh radiation and quark-hadron transition

2015

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The proposed analogy between hadron production in high-energy collisions and Hawking-Unruh radiation process in the black holes shall be extended. This mechanism provides a theoretical basis for the freeze-out parameters, the temperature (T ) and the baryon chemical potential (µ), characterizing the final state of particle production. The results from charged black holes, in which the electric charge is related to µ, are found comparable with the phenomenologically deduced parameters from the ratios of various particle species and the higher-order moments of net-proton multiplicity in thermal statistical models and Polyakov linear-sigma model. Furthermore, the resulting freeze-out condition E / N ≃ 1 GeV for average energy per particle is in good agreement with the hadronization process in the high-energy experiments. For the entropy density (s), the freeze-out condition s/T 3 ≃ 7 remains valid for µ < ∼ 0.3 GeV. Then, due to the dependence of T on µ, the values of s/T 3 increase with increasing µ. In accordance with this observation, we found that the entropy density remains constant with increasing µ. Thus, we conclude that almost no information is going lost throughHawking-Unruh radiation from charged black holes. It is worthwhile to highlight that the freeze-out temperature from charged black holes is determined independent on both freeze-out conditions.

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Section: Introductionmentioning

confidence: 99%

Chemical freeze-out in Hawking-Unruh radiation and quark-hadron transition

2015

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“…From the Table, it is clear that the multi-strange heavier baryons freeze-out a little earlier than the singly strange and the other lighter nonstrange particles. This phenomena, known as sequential freeze-out, is also seen in heavy ion collisions at RHIC and LHC [6,8]. However, it is not much apparent in case of p-p collisions as is evident from little differences between the freeze-out temperatures of lighter and heavier particles in Table 2.…”

Section: Transverse Momentum Spectramentioning

confidence: 83%

“…Though the details of the model used here can be found elsewhere [5][6][7][8][9][10][11] however for the sake of convenience we will briefly describe our model here. In a statistical hydrodynamic description taking into account the flow in the transverse and longitudinal directions, the final state particles will leave the hadronic resonance gas (HRG) at the time of freeze-out.…”

Section: Modelmentioning

confidence: 99%

Indication of Collective flow and Transparency in p-p Collisions at LHC.

Bashir¹,

Uddin²

2017

Proceedings of 7th International Conference on Physics and Astrophysics of Quark Gluon Plasma — PoS(ICPAQGP2015)

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. The mid-rapidity transverse momentum spectra of various hadrons and the available rapidity distributions of some strange hadrons produced in p-p collisions at LHC energy √s NN = 7.0 TeV have been studied using a Unified Statistical Thermal Freeze-out Model (USTFM). The calculated results are found to be in good agreement with the experimental data. The theoretical fits of the transverse momentum spectra using the model calculations provide the thermal freeze-out conditions in terms of the temperature and collective flow parameters for different hadronic species. The study reveal the presence of significant collective flow and a well defined temperature in the system thus indicating the formation of a thermally equilibrated hydrodynamic system in p-p collisions at LHC. Moreover, the fits to the available experimental rapidity distributions data of strange hadrons show the effect of almost complete transparency in p-p collisions at LHC. The transverse momentum distributions of protons and kaons produced in p-p collisions at √s NN = 200 GeV and √s NN = 2.76 TeV have also been reproduced successfully. The model incorporates longitudinal as well as a transverse hydrodynamic flow. The contributions from heavier decay resonances have also been taken into account. We have also imposed the criteria of exact strangeness conservation in the system.

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“…In an earlier attempt [19,20] we have studied the transverse momentum distribution and rapidity distribution of various hadrons at various RHIC energies and centralities. In this analysis we have made a separate analysis of how the extracted parameters of the model vary with √ s NN of the colliding system.…”

Section: Resultsmentioning

confidence: 99%