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Descriptions de la matière nucléaire incluant la structure en quarks des hadrons

Abstract : It is nowadays well established that nucleons are composite objects made of quarks and gluons, whose interactions are described by Quantumchromodynamics (QCD). However, because of the non-perturbative character of QCD at the energies of nuclear physics, a description of atomic nuclei starting from quarks and gluons is still not available. A possbile alternative is to construct effective field theories based on hadronic degrees of freedom, in which the interaction is constrained by QCD. In this framework, we have constructed descriptions of infinite nuclear matter in relativistic mean field theories taking into account the quark structure of hadrons. In a first approach, the in medium modifications of mesons properties is dynamically obtained in a Nambu-Jona-Lasinio (NJL) quark model. This modification is taken into account in a relativistic mean field theory based on a meson exchange interaction between nucleons. The in-medium modification of mesons masses and the properties of infinite nuclear matter have been studied. In a second approach, the long and short range contributions to the in-medium modification of the nucleon are determined. The short range part is obtained in a NJL quark model of the nucleon. The long range part, related to pions exchanges between nucleons, has been determined in the framework of Chiral Perturbation theory. These modifications have been used to constrain the couplings of a point coupling relativistic mean field model. A realistic description of the saturation properties of nuclear matter is obtained
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Rémi Huguet. Descriptions de la matière nucléaire incluant la structure en quarks des hadrons. Physique Nucléaire Théorique [nucl-th]. Université Sciences et Technologies - Bordeaux I, 2008. Français. ⟨tel-00410091⟩

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