Nonperturbative Effects in Operator Product Expansion as the Origin of the Enhancement Factors in the ρ-MESON QCD Sum Rule
Abstract
Taking the extended Nambu-Jona-Lasinio model as the low energy effective Lagrangian of QCD, we studied nonperturbative effects in the operator product expansion in QCD sum rule. It is shown that the phenomenological enhancement factors needed to fit the data of the ρ-meson sum rule can be explained by such nonperturbative effects.
- Publication:
-
Commemorating the Past and Looking Towards the Future OCPA 2000
- Pub Date:
- August 2002
- DOI:
- Bibcode:
- 2002cplf.conf..221Y