UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS

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2024-11-23 17:50
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Conference: Bucharest University Faculty of Physics 2017 Meeting


Section: Nuclear and Elementary Particles Physics


Title:
Flow studies in nucleus-nucleus and proton-nucleus collisions at the FAIR-GSI available energies


Authors:
Teodora Andreea PETRUSE (1), Alexandru JIPA (2), Oana RISTEA (2), Catalin RISTEA (2)


Affiliation:


E-mail
teodorapetruse@gmail.com


Keywords:
relativistic nuclear collisions, directed flow, elliptic flow, FAIR-GSI


Abstract:
In high energy nuclear collisions, hot and dense nuclear matter is produced and a phase transition to quark-gluon plasma could appear. Azimuthal anisotropy of emitting particles in momentum space has been studied as a probe to access the early stage of collisions. In non-central collisions, the initial overlap of two nuclei has a spatial anisotropy like an almond shape and due to different pressure gradients more particles are emitted to the direction of the short axis of the ellipse. Therefore, the initial spatial anisotropy makes an anisotropy in momentum space. The azimuthal distribution of produced particles (with respect to the reaction plane) in the momentum space can be expressed by a Fourier expansion,where the Fourier coefficients v 1 and v 2 represent the strength of directed flow and elliptic flow. In this work we will present a study of Fourier coefficients, v 1 and v 2 , of the anisotropic flow produced in heavy ion collisions at relativistic energies. The study is made for different types of particles (charged pions, kaons and protons) at different collision centralities. We analyzed the simulated data obtained using the AMPT (default and string melting version) and UrQMD simulation codes for Au – Au collisions at relativistic energies corresponding to FAIR-GSI energies in order to see if a partonic matter is created in the initial state of the collision. The simulated results will be compared with existent experimental data from experiments in the same energy range.


References:

Phenomenological scaling of rapidity dependence for anisotropic flows in 25 MeV/nucleon Ca + Ca by quantum molecular dynamics model - Yan, T.Z. et al. Chin.Phys.Lett. 24 (2007)



Lie-Wen Chen, Vincenzo Greco, Che Ming Ko, Peter F. Kolb, Pseudorapidity dependence of anisotropic flows in relativistic heavy-ion collisions, Physics Letters B, Volume 605, Issue 1, 2005, Pages 95-100, ISSN 0370-2693