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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 1:25 |
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Conference: Bucharest University Faculty of Physics 2003 Meeting
Section: Nuclear and Elementary Particles Physics
Title:
The study of freeze-out temperatures and transverse flow velocities in Au-Au Collisions at BRAHMS Experiment
Authors:
Oana Ristea for BRAHMS Collaboration
Affiliation:
Faculty of Physics, University of Bucharest
E-mail
Keywords:
Abstract:
The objective of ultrarelativistic heavy ions collisions is to produce an energy density and a temperature in the region of overlap between two colliding ions, that is high enough that quarks, initially confined in hadrons, can move freely. The study of this phase transition between quark-gluon plasma and hadron plasma provide information about the Universe evolution. The present cosmological theories consider that, in the early Universe existed such state of deconfinemed quarks and gluons, a few microsec. after Big Bang.
At RHIC (Relativistic Heavy Ions Collider) - BNL (Brookhaven National Laboratory), the BRAHMS (Broad RAnge Hadron Magnetic Spectrometers) measured hadron spectra from Au-Au collisions at 200 AGeV. From charged pions, kaons, protons and antiprotons transverse mass spectra we determine the effective temperatures and particles yields.The mass dependence of the effective temperatures provides evidence of colective transverse flow of the nuclear matter formed in these collisions. We deduce the velocity of the collective transverse expansion of hadrons produced in these collisions until they freeze-out at a temperature Tfo. We study the flow velocity and the freeze-out temperature dependence of centrality of the collisions for charged pions, kaons, protons and antiprotons.
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