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Spectra and radial flow at RHIC with Tsallis statistics in a Blast-Wave description

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arxiv 0812.1609 v2 pith:MCNFA4IO submitted 2008-12-09 nucl-ex

Zebo Tang , Yichun Xu , Lijuan Ruan , Gene van Buren , Fuqiang Wang , Zhangbu Xu This is my paper
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keywords collisionsblast-wavecentraltsallisrhicspectrasystemcollective
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abstract

We have implemented the Tsallis statistics in a Blast-Wave model and applied it to mid-rapidity transverse-momentum spectra of identified particles measured at RHIC. This new Tsallis Blast-Wave function fits the RHIC data very well for $p_T<$3 GeV/$c$. We observed that the collective flow velocity starts from zero in p+p and peripheral Au+Au collisions growing to 0.470 $\pm$ 0.009($c$) in central Au+Au collisions. The $(q-1)$ parameter, which characterizes the degree of non-equilibrium in a system, changes from $0.100\pm0.003$ in p+p to $0.015\pm0.005$ in central Au+Au collisions, indicating an evolution from a highly non-equilibrated system in p+p collisions toward an almost thermalized system in central Au+Au collisions. The temperature and collective velocity are well described by a quadratic dependence on $(q-1)$. Two sets of parameters in our Tsallis Blast-Wave model are required to describe the meson and baryon groups separately in p+p collisions while one set of parameters appears to fit all spectra in central Au+Au collisions.

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Cited by 5 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. OpenAlex reports about 240 citations worldwide. Full citation record

  1. Evidence for differential kinetic freeze-out of the $\phi(1020)$ meson in Pb-Pb collisions at $\sqrt{s_{\rm NN}} = 2.76$ TeV

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    Blast-wave contour analysis of ALICE φ(1020) pT spectra excludes the bulk π/K/p freeze-out point at 4.1σ, indicating earlier kinetic decoupling of the φ meson.

  2. An expanding spherical fireball model for light hadron production at RHIC ($\sqrt{s_{\rm NN}}=7.7$--$39$ GeV)

    nucl-th 2026-07 conditional novelty 4.0 of 10

    An expanding spherical fireball model with Cooper–Frye freeze-out describes STAR pT spectra of π±, K±, p, p̄ at √sNN=7.7–39 GeV and predicts Gaussian rapidity distributions.

  3. Mass-Dependent Non-Extensivity in Tsallis Blast-Wave Fits to Identified Hadron $p_T$ Spectra at RHIC and LHC

    nucl-th 2026-06 unverdicted novelty 4.0 of 10

    Mass-dependent parameterizations of the non-extensivity parameter q improve Tsallis Blast-Wave fits to identified hadron pT spectra from RHIC and LHC collisions.

  4. Spectra and elliptic flow of light hadrons in an expanding fire-cylinder model for the RHIC Beam Energy Scan

    nucl-th 2026-02 unverdicted novelty 3.0 of 10

    An expanding fire-cylinder model fitted to pion pT spectra describes spectra of other light hadrons and qualitatively matches their elliptic flow in peripheral Au+Au collisions at BES energies.

  5. Thermodynamic Analysis of Transverse Momentum Spectra in Pb-Pb Collisions at 2.76 TeV: Centrality Dependence of Temperature, Freezeout Parameters and Non-Extensitivity

    hep-ph 2025-07 conditional novelty 3.0 of 10

    Individual Tsallis fits to ALICE Pb-Pb 2.76 TeV pion, kaon, and proton spectra give effective temperatures and freezeout volumes that rise toward central collisions while the nonextensivity parameter q falls, a patter...

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