Identified particle spectra in Pb-Pb, Xe-Xe and p-Pb collisions with Tsallis blast-wave model

Abstract

We investigate the identified hadrons transverse momentum ($p_{\mathrm{T}}$) spectra in Pb-Pb (Pb-Pb, Xe-Xe, p-Pb) collisions at $\sqrt{s_{\mathrm{NN}}}=$ 2.76 (5.02, 5.44, 5.02) TeV in the framework of Tsallis-blast wave (TBW) model with a linear transverse velocity profile and with a constant velocity profile. In this model, the Tsallis temperature ($T$), the average radial flow velocity ($⟨\beta ⟩$) and the degree of non-equilibrium ($q$) of the system are common for all hadrons when a combined fit is performed to the $p_{\mathrm{T}}$ spectra of different particles at a given centrality. It is found that the model can describe the particle spectra well up to 3 GeV/c. For both profiles, the transverse flow velocity decreases from central to peripheral collisions while the non-extensive parameter $q$ exhibits the opposite behavior, indicating a more rapid expansion and less off-equilibrium of the system in more central collisions. Moreover, we observe that in central collisions $⟨\beta ⟩$ and $q$ ($T$) from the fit with the linear profile are smaller (is slightly larger) than those (that) with the constant profile, while in peripheral collisions $⟨\beta ⟩$, $T$ and $q$ from the former are compatible with those from the latter. We also derived and discussed the relation between the Tsallis temperature and the thermal temperature. In addition, to check whether a scenario of an early freeze-out of strange particles at the LHC exists, the particle spectra are investigated by grouping them into strange and non-strange hadrons. The combined fit gives an insight on the degree of non-equilibrium, the radial flow and the Tsallis temperature of the system at the kinetic decoupling. It provides a comparison between the results at different energies in the same collision system and the results in different collision systems at the same or similar energy.

arXiv commentUpdated version. 13 pages, 6 figures, 4 tables, Accepted by J. Phys. G

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Cited by in corpus (13)

• Collective expansion in pp collisions using the Tsallis statistics
• Study of Dependence of Kinetic Freezeout Temperature on the Production Cross Section of Particles in Various Centrality Intervals in Au Au and Pb Pb Collisions at High Energies
• The Novel Scaling of Tsallis Parameters from the Transverse Momentum Spectra of Charged Particles in Heavy-Ion Collisions
• Nonextensive hydrodynamics of boost-invariant plasmas
• The universal scaling of kinetic freeze-out parameters across different collision systems at the LHC energy
• Hadron transverse momentum distributions in the Tsallis statistics with escort probabilities
• Multiplicity dependence of the freezeout parameters in high energy hadron-hadron collisions
• Exploring Anisotropic flow via the Boltzmann Transport Equation Employing the Tsallis Blast Wave Description at LHC energies
• Particle species and energy dependencies of freeze-out parameters in high-energy proton-proton collisions
• Non-extensive (3+1)-dimensional hydrodynamics for relativistic heavy-ion collisions
• Analyzing the Correlation Between Thermal and Kinematic Parameters in Various Multiplicity Classes within 7 and 13 TeV pp Collisions
• QCD phase transition at finite temperature and chemical potential with the non-extensive statistics
• Random statistical analysis of transverse momentum spectra of strange particles and dependence of related parameters on centrality in high energy collisions at the LHC