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Sep 5 – 9, 2022
online
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Analysis of midrapidity pt distributions of identified charged particles in Xe+Xe collisions at (snn)1/2=5.44 TeV using non-extensive Tsallis statistics with included transverse flow

Sep 8, 2022, 4:30 PM
20m
online

online

FSU, Tallahassee, FL, USA
oral presentation Heavy Ions

Speaker

Khusniddin Olimov (Physical-Technical Institute of Uzbekistan Academy of Sciences)

Description

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=5.44 TeV, have been described 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, 〈β_t 〉, and q extracted in Xe+Xe collisions at (snn)1/2=5.44 TeV using both consistent and non-consistent Tsallis function with included transverse flow have demonstrated 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, suggesting an increase in degree of system thermalization with increasing centrality of heavy-ion collisions. The extracted average transverse flow velocity has demonstrated significantly different growth rates in regions <Npart> < 44±5 and <Npart> > 44±5, and parameter T0 has stayed constant within uncertainties in <Npart> > 44±5 range in Xe+Xe collisions at (snn)1/2=5.44 TeV. It is argued that <Npart>  44±5 (<dNch/d>  158±20) could 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=5.44 TeV. The results obtained in present work for high-energy Xe+Xe collisions have been compared with those for high-energy Pb+Pb collisions at the LHC. Depletion (enhancement) of (p+p ̅)/(π^++π^-) ratio at low pt (intermediate pt) has been observed in present work in Xe+Xe collisions at (snn)1/2=5.44 TeV, which is consistent 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 〈β_t 〉 versus <Npart> and (p+p ̅)/(π^++π^-) versus <dNch/d> dependencies, we have verified that the depletion (enhancement) of baryon-to-meson ratio at low pt (intermediate pt) values with increasing <dNch/d>, observed in high-energy Xe+Xe and Pb+Pb collisions at the LHC, is due to radial flow effects.

Primary author

Khusniddin Olimov (Physical-Technical Institute of Uzbekistan Academy of Sciences)

Presentation materials