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QCD Sum Rules and Soft-Hard Interplay for Hadronic Form Factors

  • A. V. Radyushkin
Part of the Few-Body Systems book series (FEWBODY, volume 11)

Abstract

We 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 (α s /π) ~ 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 quarkhadronic duality approach in all cases are close to existing data, providing an experimental evidence that hard terms are small.

Keywords

Form Factor Operator Product Expansion Soft Term Hard Scattering Pion Form Factor 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 1999

Authors and Affiliations

  • A. V. Radyushkin
    • 1
    • 2
    • 3
  1. 1.Physics DepartmentOld Dominion UniversityNorfolkUSA
  2. 2.Jefferson LabNewport NewsUSA
  3. 3.Laboratory of Theoretical PhysicsJINRDubnaRussia

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