QCD sum rules and soft-hard interplay for hadronic form factors
Journal Article
·
· Few Body Syst.Suppl. 11 (1999) 57-65
OSTI ID:756040
The authors discuss two types of contributions to hadronic form factors in QCD: hard gluon exchange and soft wave function overlap. Within the QCD sum rule approach, the hard contribution has strong numeric suppression by factor ({alpha}{sub s}/{pi}) {approximately} 0.1 for each exchange. For this reason, the soft contribution dominates at accessible momentum transfers. The ``humpy'' distribution amplitudes used to enhance hard terms cannot be derived from QCD sum rules in a self-consistent way. The estimates of soft terms obtained within the local quark-hadronic duality approach in all cases are close to existing data, providing an experimental evidence that hard terms are small.
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Organization:
- USDOE Office of Energy Research (ER) (US)
- DOE Contract Number:
- AC05-84ER40150
- OSTI ID:
- 756040
- Report Number(s):
- DOE/ER/40150-1523; JLAB-THY-98-44; hep-ph/9811225; TRN: US0002712
- Journal Information:
- Few Body Syst.Suppl. 11 (1999) 57-65, Other Information: Submitted to Few Body Syst.Suppl. 11 (1999) 57-65; PBD: 1 Nov 1998
- Country of Publication:
- United States
- Language:
- English
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