Simultaneous Analysis of Midrapidity pT Spectra of Identified Particle Species in Pb + Pb Collisions at (Formula presented.) TeV Using Tsallis Distribution with Transverse Flow
Olimov K.K. Lebedev I.A. Fedosimova A.I. Liu F.-H. Kanokova S.Z. Shodmonov M.Z. Tukhtaev B.J.
December 2022MDPI
Universe
2022#8Issue 12
The midrapidity transverse momentum distributions of the charged pions, kaons, protons, and antiprotons in ten groups of centrality of Pb + Pb collisions at (Formula presented.) = 2.76 TeV, measured by the ALICE Collaboration, have been analyzed successfully using both thermodynamically consistent and non-consistent Tsallis distribution functions with transverse flow. The collision centrality dependencies of the extracted parameters of two kinds of Tsallis functions with transverse flow have been investigated. The significantly different behavior (growth rates) of 〈βT〉 in regions (Formula presented.) < 71 and (Formula presented.) > 71 with the temperature T0 becoming constant in region (Formula presented.) > 71 has been observed. This could indicate that (Formula presented.) = 71 ± 5 (corresponding to (Formula presented.) = 205 ± 15) is a threshold border value of collision centrality for crossover phase transition from the dense hadronic state to the QGP state (or a mixed state of QGP and hadrons) in Pb + Pb collisions at (Formula presented.) = 2.76 TeV. This conjecture is supported further by the observed, significantly different correlations between T0 and (Formula presented.) parameters in the corresponding (Formula presented.) < 0.44 and (Formula presented.) > 0.44 ranges. The strong positive linear correlation between non-extensivity parameter q for pions and kaons, between q for pions and (anti)protons, and between q for kaons and (anti)protons has been obtained. The parameter q for all studied particle species has proven to be strongly anticorrelated with the average transverse flow velocity, 〈βT〉. Quite a large positive linear correlation has been obtained between the q of the studied particle species and temperature parameter T0. Analysis of q versus (Formula presented.) dependencies for the studied particle species suggests that the highly thermalized and equilibrated QGP is produced in central Pb + Pb collisions at (Formula presented.) = 2.76 TeV with (Formula presented.) > 160.
non-extensivity parameter q , Pb + Pb collisions at the LHC , phase transition to QGP , system thermalization and equilibrium , transverse momentum distributions , Tsallis statistics with transverse flow
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Physical-Technical Institute of Uzbekistan Academy of Sciences, Chingiz Aytmatov Str. 2b, Tashkent, 100084, Uzbekistan
Faculty of Engineering, New Uzbekistan University (NUU), Tashkent, 100007, Uzbekistan
Institute of Physics and Technology, Satbayev University, Almaty, 050032, Kazakhstan
Institute of Nuclear Physics, Almaty, 050032, Kazakhstan
Institute of Theoretical Physics, Collaborative Innovation Center of Extreme Optics, State Key Laboratory of Quantum Optics and Quantum Optics Devices, Shanxi University, Taiyuan, 030006, China
Physical-Technical Institute of Uzbekistan Academy of Sciences
Faculty of Engineering
Institute of Physics and Technology
Institute of Nuclear Physics
Institute of Theoretical Physics
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