Study of midrapidity p t distributions of identified charged particles in Xe + Xe collisions at (s nn) 1 / 2= 5. 4 4 TeV using non-extensive Tsallis statistics with transverse flow
Olimov K.K. Liu F.-H. Musaev K.A. Olimov K. Shodmonov M.Z. Fedosimova A.I. Lebedev I.A. Kanokova S.Z. Tukhtaev B.J. Yuldashev B.S.
20 May 2022World Scientific
Modern Physics Letters A
2022#37Issue 15
The midrapidity transverse momentum (pt) distributions of the charged pions and kaons, protons, and antiprotons, measured by ALICE Collaboration at nine centrality groups of Xe+Xe collisions at (snn)1/2 = 5.44TeV, have been reproduced quite well using simultaneous (combined) minimum χ2 fits with the simple (non-consistent) as well as thermodynamically consistent Tsallis function with included transverse flow. The parameters T0, (βt), and q extracted in this work using both consistent and non-consistent Tsallis function with included transverse flow demonstrate the similar dependencies on collision centrality ((Npart)). The obtained non-extensivity parameter q values decrease systematically for all studied particle species with increasing Xe+Xe collision centrality, indicating an increase in degree of system thermalization with increasing centrality of heavy-ion collisions. The average transverse flow velocity demonstrates significantly different growth rates in regions (Npart) < 44 ± 5 and (Npart) > 44 ± 5, and parameter T0 stays constant within uncertainties in (Npart) > 44 ± 5 range in Xe+Xe collisions at (snn)1/2 = 5.44TeV. It is argued that (Npart)≈ 44 ± 5((dNch/dη)≈ 158 ± 20) could possibly be a threshold border value for a crossover transition from a dense hadronic state to the QGP phase (or mixed phase of QGP and hadrons) in Xe+Xe collisions at (snn)1/2 = 5.44TeV. Depletion (enhancement) of (p + p )/(π+ + π-) ratio at low pt (intermediate pt) has been observed in this work in Xe+Xe collisions at (snn)1/2 = 5.44TeV, which agrees with the similar results of ALICE Collaboration obtained recently in high-energy Xe+Xe and Pb + Pb collisions at the LHC. Analyzing and reflecting the extracted (βt) versus Npart and (p + p )/(π+ + π-) versus (dNch/dη) dependencies, we have verified that the depletion (enhancement) of baryon-to-meson ratio at low pt (intermediate pt) values with increasing (dNch/dη) is due to radial flow effects.
Collision system thermalization , Deconfinement phase transition , Heavy-ion collisions at the LHC , Non-extensive Tsallis statistics with embedded transverse flow , Transverse momentum distributions of particles
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Physical-Technical Institute of Uzbekistan Academy of Sciences, Chingiz Aytmatov Str. 2 b, Tashkent, 100084, Uzbekistan
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
Institute of Nuclear Physics, Almaty, Kazakhstan
Institute of Physics and Technology, Satbayev University, Almaty, Kazakhstan
Institute of Nuclear Physics of Uzbekistan Academy of Sciences, Tashkent, Uzbekistan
Laboratory of High Energy Physics, Joint Institute for Nuclear Research, Dubna, 141980, Russian Federation
Physical-Technical Institute of Uzbekistan Academy of Sciences
Institute of Theoretical Physics
Institute of Nuclear Physics
Institute of Physics and Technology
Institute of Nuclear Physics of Uzbekistan Academy of Sciences
Laboratory of High Energy Physics
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