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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 18:06 |
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Conference: Bucharest University Faculty of Physics 2023 Meeting
Section: Nuclear and Elementary Particles Physics
Title:
The study of the mean transverse momentum of strange hadrons produced in relativistic nuclear collisions
Authors:
Diana DEARA (1), Oana RISTEA (1), Catalin RISTEA (2)
Affiliation:
1) University of Bucharest, Faculty of Physics, Magurele
2) Institute of Space Science, Bucharest-Magurele
E-mail
dianadeara@yahoo.com
Keywords:
relativistic nuclear collisions; matter; collective flow; mean transverse momentum; strangeness
Abstract:
Heavy-ion collisions at high energies create extreme conditions of temperature and density, where the nuclear matter undergoes unique phase transitions. One of these phases is Quark-Gluon Plasma(QGP), a state of matter in which quarks and gluons are deconfined. The study of this phase of nuclear matter provides insights into the early Universe. After the collision, due to multiple interactions between the constituents, quarks and gluons, the produced system reaches thermal equilibrium and the deconfined matter develops a hydrodynamic flow behaviour. During this process, the system’s volume increases and it starts to cool down leading to the confinement of matter. The produced hadrons undergo multiple elastic and inelastic collisions until the system reaches the kinetic freeze-out stage, when all the interactions between them cease and their transverse momentum distributions become fixed. The collective flow velocity of the fireball will affect the transverse momentum spectra of the produced particles. The shape of the pT spectra modifies due to this collective motion of the system, with a stronger influence on heavier particles. Based on the pT spectra of strange hadrons, the mean transverse momentum of the 〖 K〗^0 s, Λ, ( Λ) ̅ , Ξ^-, ( Ξ) ̅^+, Ω^-, Ω ̅^+, was obtained. The analyzed data were obtained in Au+Au collisions at RHIC-BES energies (√(s_NN ) = 7.7 GeV, 11.5 GeV, 19.6 GeV, 27 GeV and 39 GeV). The results will be compared with 〈pT 〉 of non-strange hadrons. The dependence of the mean transverse momentum 〈pT 〉 on particle species and event centrality at various incident energies will be presented and discussed. Special emphasis will be given on particles containing one or more strange quarks, strangeness being an important observable in the search for deconfined state of matter.
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