Combined analysis of midrapidity transverse momentum distributions of the charged pions and kaons, protons and antiprotons in p + Pb collisions at snn = 5.02 TeV at the LHC
Olimov K.K. Lebedev I.A. Fedosimova A.I. Liu F.-H. Sanetullaev A. Tokhirov A. Khudoyberdieva S.A. Kakhorova A.N. Yuldashev B.S.
May 2024Springer Science and Business Media Deutschland GmbH
European Physical Journal Plus
2024#139Issue 5
The experimental midrapidity transverse momentum spectra of the charged pions and kaons, protons and antiprotons in seven centrality classes of p + Pb collisions at snn = 5.02 TeV, measured by the ALICE Collaboration, have been described quite well using simultaneous minimum χ2 fits by thermodynamically consistent as well as non-consistent Tsallis function with incorporated transverse flow. The border (threshold) value of the average number of participant nucleons, where the transverse radial flow starts emerging in p + Pb collisions at snn = 5.02 TeV, has been estimated to be ⟨Npart⟩ = 4.0 ± 0.5. The values of kinetic freeze-out temperature, T0, increase with an increase in ⟨Npart⟩ in region up to ⟨Npart⟩ ≈ 4 and remain constant within uncertainties, showing a plateau, in region ⟨Npart⟩ > 4 in p + Pb collisions at snn = 5.02 TeV. The behavior of the freeze-out temperature, T0, versus collision centrality (versus ⟨Npart⟩), in p + Pb collisions at snn = 5.02 TeV proved to be similar to the dependence of T0 on charged-particle multiplicity density at midrapidity in p + p collisions at (s)1/2 = 7 and 13 TeV at the LHC. Non-extensivity parameter q has decreased consistently for all analyzed particle species with an increase in ⟨Npart⟩, suggesting that the degree of the system thermalization and equilibrium increases with increasing centrality of p + Pb collisions. Non-extensivity parameter q has been strongly anticorrelated with parameter ⟨βT⟩ as well as ⟨Npart⟩ for all analyzed particle species. We have observed very strong positive correlation between parameter q for the charged pions and q for the charged kaons, which could be due to strong resemblance of the mechanisms of production of pions and kaons, which have similar structure consisting of one quark and one antiquark. The positive correlation between q (pions) and q ((anti)protons) as well as between q (kaons) and q ((anti)protons) has been also quite strong. The correlations among parameters q of the analyzed particle species in p + Pb collisions have been very similar to those observed earlier in high-energy Pb + Pb collisions and differed significantly from those in proton-proton collisions at the LHC.
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Physical-Technical Institute of Uzbekistan Academy of Sciences, Chingiz Aytmatov Str. 2B, Tashkent, 100084, Uzbekistan
New Uzbekistan University, Tashkent, Uzbekistan
Institute of Physics and Technology, Satbayev University, Almaty, Kazakhstan
National University of Science and Technology MISIS (NUST MISIS), Almalyk Branch, Almalyk, Uzbekistan
Institute of Nuclear Physics, Almaty, Kazakhstan
Institute of Theoretical Physics, Shanxi University, Taiyuan, 030006, China
Samarkand State University Named After Sh. Rashidov, Samarkand, Uzbekistan
Institute of Nuclear Physics of Uzbekistan Academy of Sciences, Tashkent, Uzbekistan
Physical-Technical Institute of Uzbekistan Academy of Sciences
New Uzbekistan University
Institute of Physics and Technology
National University of Science and Technology MISIS (NUST MISIS)
Institute of Nuclear Physics
Institute of Theoretical Physics
Samarkand State University Named After Sh. Rashidov
Institute of Nuclear Physics of Uzbekistan Academy of Sciences
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