Centrality dependence of thermal freeze-out conditions at LHC in Pb+Pb collisions at sNN = 2.76TeV

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

doi:10.1142/s0217732315501679

Cited by 5 publications

(6 citation statements)

References 22 publications

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“…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. [26] This is an indication of the large interaction cross section of ϕ(1020) and K * (892) 0 in the nuclear medium. However, these particles decouple earlier than protons and kaons as is revealed from their kinetic freeze-out temperatures, when compared to those of protons and kaons.…”

Section: Resultsmentioning

confidence: 97%

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: Resultsmentioning

confidence: 97%

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

Bashir¹,

Uddin²

2017

Commun. Theor. Phys.

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“…The same is true also for the two component model based on the sum of Boltzmann-Gibbs distribution and a power-law term [15]. But for heavy-ion collisions and high multiplicity pp collisions these models fail to describe the measured spectra in the whole available p T range and more complex models were suggested [16][17][18][19][20][21][22][23][24], some of which include the hydrodynamical flow effects via the blast-wave model (BWM) [25,26]. The BWM alone is often used to fit the spectra in a limited p T range [13,14,[27][28][29][30] (e.g., p T ∼ 0.5-3 GeV/c [30]).…”

Section: Introductionmentioning

confidence: 91%

A three component model for hadron $$p_\mathrm {T}$$-spectra in pp and Pb–Pb collisions at the LHC

Grigoryan

2021

Eur. Phys. J. A

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A three component model, consisting of the hydrodynamical blast-wave term and two power-law terms, is proposed for an improved fitting of the hadron spectra measured at midrapidity and for arbitrary transverse momenta ( p T ) in pp and heavy-ion collisions of different centralities at the LHC. The model describes well the available experimental data for all considered particles from pions to charmonia in pp at √ s = 2.76, 5.02, 7, 8 and 13 TeV and in Pb-Pb at √ s NN = 2.76 and 5.02 TeV.0123456789().: V,-vol

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“…A common radial flow velocity for meson and anti-baryon found from the analysis of the transverse momentum data of the Tevatron [13] had been attributed to as an evidence for collectivity due to the formation of QGP. [18] Keeping in view the above facts, we in our present analysis will address the collective detailed description of our model is available in the references [5,[19][20][21][22][23][24]. We have employed the strangeness conservation criteria such that the net strangeness in the system is zero.…”

Section: /11mentioning

confidence: 99%

“…We have incorporated the effects of transverse as well as longitudinal hydrodynamic flow in the produced system. A detailed description of our model is available in the references [5,[19][20][21][22][23][24]. We have employed the strangeness conservation criteria such that the net strangeness in the system is zero.…”

Section: Statisticalmentioning

confidence: 99%

Particle Transverse Momentum Distributions in p-p Collisions at √sNN=0.9 TeV

Bashir

Parra

Bhat

et al. 2019

Advances in High Energy Physics

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The mid-rapidity transverse momentum spectra of hadrons (p, p , K + , K -, , φ, Λ, Λ , Ξ , Ξ , (Ξ + Ξ ), Ω, and Ω ) and the available rapidity distributions of the strange hadrons ( , (Λ + Λ ), (Ξ + Ξ ) produced in p-p collisions at LHC energy √s NN = 0.9 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 model incorporates longitudinal as well as a transverse hydrodynamic flow. The contributions from heavier decayresonances have also been taken into account. We have also imposed the criteria of exact strangeness conservation in the system. *inamhep@gmail.com

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Centrality dependence of thermal freeze-out conditions at LHC in Pb+Pb collisions at sNN = 2.76TeV

Abstract: The transverse momentum spectra of identified particles at midrapidity in Pb + Pb

Cited by 5 publications

References 22 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

A three component model for hadron $$p_\mathrm {T}$$-spectra in pp and Pb–Pb collisions at the LHC

Particle Transverse Momentum Distributions in p-p Collisions at √sNN=0.9 TeV

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