Mémoires de Fin d’Etudes
Etablissement
Université d’Oran1 - Ahmed Ben Bella
Affiliation
Département de Physique
Auteur
DALILE, Ahmed
Directeur de thèse
IDDIR F. (Professeur)
Filière
Physique
Diplôme
Magister
Titre
Coupled Channels Effects on Hybrid Meson States
Mots clés
Hybrid mesons; Coupled channels; QGC Model; Mesonic loops.
Résumé
Theoretical investigations have unquestionably confirmed that the effects of coupled channels, corresponding to virtual two-meson decays, are unexpectedly large on the standard mesons spectrum. The masses of resonances, estimated including the coupling to hadronic channels, are considerably shifted with respect to the bare masses calculated treating mesons as stable qq bound states. Models that incorporate these effects are able to achieve satisfactory results in comparison with experiment, overcoming many inconsistencies with standard mesonic states that the naïve quark model appears to have difficulties in reproducing them, especially the light scalars which are experimentally well established, but their classification in terms of quasi-bound systems of quark and antiquark is still far from agreed upon. In this work, we explore these effects on the hybrid mesons masses, as being corrections to the hybrid spectrum obtained from the Quark-Gluon Constituent Model. The system describing a QGC-hybrid meson and the dominant OZI-allowed combinations of two-meson decay channels that have the correct quantum numbers are treated on an equal footing.
Date de soutenance
2008
Cote
TH2796
Pagination
VIII-106F.
Format
30 cm
Notes
ABSTRACT AND KEYWORDS.BIBLIOG.
Statut
Soutenue