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Contributions Numériques à l'Etude des Fonctions de Green et des Propriétés du Vide de la Chromodynamique Quantique

Abstract : This thesis provides a lattice evaluation of the coupling constant of Quantum Chromodynamics (QCD) in Landau gauge, in ``Momentum Substraction''-like renormalisation schemes (MOM), from a non-perturbative computation of the three-gluon vertex. This work was achieved with two flavours of Wilson dynamical quarks. It takes place in a scientific program which already contains a similar analysis in the framework of the ``pure gauge'' theory. In both cases, interpreting numerical data requires the introduction of a -condensate using the technics of the operator-product expansion (OPE). The contribution of this power correction is non-negligible till 10 GeV in the ``pure gauge'' case, but taking it into account gives a satisfactory agreement between the set of ``quenched'' as well as ``unquenched'' results with experimental data. Otherwise, this work also suggests a physical mechanism creating a -condensate in the framewok of a model of instanton gaz or liquid. Moreover, this picture allows to interpret the behaviour of the strong coupling constant in the deep infra-red region in a consistent way.
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https://tel.archives-ouvertes.fr/tel-00003120
Contributor : Hervé Moutarde <>
Submitted on : Friday, July 11, 2003 - 6:03:46 PM
Last modification on : Wednesday, March 27, 2019 - 4:02:05 PM
Long-term archiving on: : Tuesday, September 11, 2012 - 9:05:39 PM

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Hervé Moutarde. Contributions Numériques à l'Etude des Fonctions de Green et des Propriétés du Vide de la Chromodynamique Quantique. Physique des Hautes Energies - Expérience [hep-ex]. Université Paris Sud - Paris XI, 2003. Français. ⟨tel-00003120⟩

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