Hadronic form factors: Perturbative QCD vs. QCD SUM rules

Journal Article · Mon Oct 01 00:00:00 EDT 1990 · Nuclear Physics A

OSTI ID:954174

Radyushkin, Anatoly

The challenging problem of applicability of the perturbative QCD to exclusive processes is revealed.The basic ingredients both of the asymptotic large Q² analysis and of the QCD sum rule approach are analyzed for the simplest and most well-studied example of the pion electromagnetic form factor.The main conclusion is that for accessible energies and momentum transfers the soft (nonperturbative) contributions dominate over those due to the hard quark rescattering subprocesses.

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-84ER40150
• OSTI ID: 954174
• Report Number(s): CEBAF-TH-91-07; NUPABL; TRN: US201014%%996
• Journal Information: Nuclear Physics A, Vol. 532; ISSN 0375-9474
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
FORM FACTORS
MOMENTUM TRANSFER
PIONS
QUANTUM CHROMODYNAMICS
QUARKS
RESCATTERING
SUM RULES