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Photo of Johan Bijnens

Johan Bijnens

Professor

Photo of Johan Bijnens

QCD Short-distance constraints and hadronic approximations

Author

  • Johan Bijnens
  • E Gamiz
  • Edisher Lipartia
  • J Prades

Summary, in English

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.

Department/s

  • Theoretical Particle Physics

Publishing year

2003

Language

English

Publication/Series

Journal of High Energy Physics

Issue

4: 055

Document type

Journal article

Publisher

Springer

Topic

  • Subatomic Physics

Keywords

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

Status

Published

ISBN/ISSN/Other

  • ISSN: 1029-8479