QCD Short-distance constraints and hadronic approximations

Johan Bijnens, E Gamiz, Edisher Lipartia, J Prades

Research output: Contribution to journalArticlepeer-review


This paper discusses a general class of ladder resummation inspired hadronic approximations. It is found that this approach naturally reproduces many successes of single meson per channel saturation models (e.g. VMD) and NJL based models. In particular the existence of a constituent quark mass and a gap equation follows naturally. We construct an approximation that satisfies a large set of QCD short-distance and large N-c constraints and reproduces many hadronic observables. We show how there exists in general a problem between QCD short-distance constraints for Green Functions and those for form factors and cross-sections following from the quark-counting rule. This problem while expected for Green functions that do not vanish in purely perturbative QCD also persists for many Green functions that are order parameters.
Original languageEnglish
JournalJournal of High Energy Physics
Issue number4: 055
Publication statusPublished - 2003

Subject classification (UKÄ)

  • Subatomic Physics

Free keywords

  • 1/N expansion
  • chiral lagrangians
  • phenomenological models
  • QCD


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