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Propriétés chimiques et dynamiques des collisions d'ions lourds aux énergies du RHIC par la mesure de la production des baryons doublement étranges dans l'expérience STAR

Abstract : Lattice QCD calculations predict, at vanishing chemical potential mu_B, a crossover from ordinary hadronic matter to a Quark Gluon Plasma. Heavy ion collisions have been proposed to recreate it in the laboratory and to study its properties. The Au+Au, d+Au collisions at sqrt(s_(NN)) = 200 GeV and the Au+Au ones at 62.4 GeV delivered at RHIC have been probed by the measurement of the Xi- and Xi+ particles in the STAR experiment. Their yield evolution with collision energy and system size gives rize to the chemical properties of the reaction in the framework of hadronic and statistical models. The nuclear modification factor, R_(CP), of Xi shows: (1) a meson/baryon dependence for 2 < p_T < 5 GeV/c well reproduced by quark coalescence and recombination models, (2) the formation of a dense matter signed by a R_(CP) suppression at p_T > 3 GeV/c, (3) strong interactions between constituants suggesting the existence of strong collectivity in the medium. The Xi transverse flow and more generally the multistrange baryon flow seems to be interesting to probe the early stage the collision with presumably partonic degrees of freedom. It is studied and discussed in this thesis.
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https://tel.archives-ouvertes.fr/tel-00011024
Contributor : Magali Estienne <>
Submitted on : Thursday, November 17, 2005 - 6:31:53 PM
Last modification on : Monday, June 15, 2020 - 3:00:02 PM
Long-term archiving on: : Friday, April 2, 2010 - 10:42:57 PM

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  • HAL Id : tel-00011024, version 1

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Magali Estienne. Propriétés chimiques et dynamiques des collisions d'ions lourds aux énergies du RHIC par la mesure de la production des baryons doublement étranges dans l'expérience STAR. Physique Nucléaire Théorique [nucl-th]. Université de Nantes, 2005. Français. ⟨tel-00011024⟩

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