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Average transverse expansion velocities and global freeze-out temperatures in central Cu + Cu, Au + Au, and Pb + Pb collisions at high energies at RHIC and LHC

Olimov, Khusniddin K ; Kanokova, Shakhnoza Z ; Olimov, Kosim ; Gulamov, Kadyr G ; Yuldashev, Bekhzod S ; Lutpullaev, Sagdulla L ; Umarov, Farkhod Y

Modern physics letters A, 2020-05, Vol.35 (14), p.2050115 [Periódico revisado por pares]

Singapore: World Scientific Publishing Company

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  • Título:
    Average transverse expansion velocities and global freeze-out temperatures in central Cu + Cu, Au + Au, and Pb + Pb collisions at high energies at RHIC and LHC
  • Autor: Olimov, Khusniddin K ; Kanokova, Shakhnoza Z ; Olimov, Kosim ; Gulamov, Kadyr G ; Yuldashev, Bekhzod S ; Lutpullaev, Sagdulla L ; Umarov, Farkhod Y
  • Assuntos: Antiparticles ; Antiprotons ; Atomic collisions ; Copper ; Gold ; Heavy ions ; Invariants ; Ionic collisions ; Kaons ; Pions ; Protons ; Relativistic Heavy Ion Collider ; Spectra ; Transverse momentum
  • É parte de: Modern physics letters A, 2020-05, Vol.35 (14), p.2050115
  • Descrição: The experimental invariant transverse momentum ( p t ) spectra of the charged pions and kaons, protons and antiprotons, produced at midrapidity in central (0–10%) Au + Au collisions at ( s n n ) 1 / 2 = 6 2 . 4 GeV , central (0–10%) Cu + Cu collisions at ( s n n ) 1 / 2 = 2 0 0 GeV , central (0–10%) Au + Au collisions at ( s n n ) 1 / 2 = 2 0 0 GeV , and central (0–5%) Pb + Pb collisions at ( s n n ) 1 / 2 = 2 . 7 6 TeV , measured by BRAHMS, STAR and ALICE collaborations, were analyzed using three different transverse expansion (blast-wave) models: Siemens–Rasmussen blast-wave model, Simple transverse flow model, and Simplified (hydro-inspired) blast-wave model of Schnedermann et al. Combined (simultaneous) minimum χ 2 fits of the experimental invariant p t spectra of the charged pions and kaons, protons and antiprotons with the above three model functions were conducted, using the identical selected optimal fitting ranges in p t in each studied collision system, and the values of the average transverse expansion velocity ( 〈 β t 〉 ) and global kinetic freeze-out temperature ( T f o ) and their dependencies on the collision system ( 〈 N part 〉 ) and ( s n n ) 1 / 2 were extracted. The combined (simultaneous) fits using Hagedorn formula with the (embedded) simple transverse flow describe well the experimental invariant p t spectra of the charged pions, kaons, protons and antiprotons in the whole measured range in region p t ≥ 0 . 5 GeV / c in the analyzed central heavy ion collisions at RHIC and LHC, reproducing qualitatively well all the established dependencies of the parameters 〈 β t 〉 and T f o on the collision system ( 〈 N part 〉 ) and ( s n n ) 1 / 2 . The obtained results were compared with those of the previous analyses of high energy heavy ion collisions.
  • Editor: Singapore: World Scientific Publishing Company
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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