A nucleon description based on confinement and a dynamic generation of the quark masses
Langue
en
Article de revue
Ce document a été publié dans
Nuclear Physics A. 2010-06-01, vol. 837, p. 15-25
Elsevier
Résumé en anglais
We have considered the nucleon as an MIT bag, but instead of a perturbative vacuum, we use a QCD vacuum modified as compared to the outside space and hence a modified quark-condensate. Quarks acquire their constituent-masses ...Lire la suite >
We have considered the nucleon as an MIT bag, but instead of a perturbative vacuum, we use a QCD vacuum modified as compared to the outside space and hence a modified quark-condensate. Quarks acquire their constituent-masses through their interactions with this modified QCD vacuum in a framework of an NJL model. The value of the quark condensate modified in the nucleon is then determined self-consistently by the equilibrium condition for the bag: the outward pressure due to both the motion of three quarks and the modified vacuum in the nucleon must be counterbalanced by the inward pressure of the vacuum outside the bag. We are able to pass continuously from a nucleon description in a pure MIT bag model to a description using constituent quark masses determined in an NJL model.< Réduire
Mots clés en anglais
Nambu–Jona-Lasinio model
Dynamic generation of the quark masses
MIT bag
Pion–nucleon sigma term
Origine
Importé de halUnités de recherche