Johan Bijnens
Professor, Deputy Head of Division
QCD Short-distance constraints and hadronic approximations
Author
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 - Has been reorganised
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