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Problems at the Interface between Perturbative and Nonperturbative Quantum Chromodynamics

  • Stanley J. Brodsky
  • G. T. Bodwin
  • G. Peter Lepage
Part of the Progress in Physics book series (PMP, volume 8)

Abstract

Predictions based on perturbative QCD1 rest on three premises: (1) that hadronic interactions become weak in strength at small invariant separation r ≪ A QCD −1 ; (2) that the perturbative expansion in α s (Q) is well-defined; and (3) factorization: all effects of collinear singularities, confinement, nonperturbative interactions, and bound state dynamics can be isolated at large momentum transfer in terms of (process independent) structure functions G i/H (x,Q), fragmentation functions D H/ i(z,Q), or in the case of exclusive processes, distribution amplitudes φ H (x i ,Q).2

Keywords

Transverse Momentum Structure Function Perturbative Expansion Loop Order Renormalization Scheme 
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Copyright information

© Birkhäuser Boston, Inc. 1983

Authors and Affiliations

  • Stanley J. Brodsky
    • 1
  • G. T. Bodwin
    • 2
  • G. Peter Lepage
    • 3
  1. 1.Stanford Linear Accelerator CenterStanford UniversityStanfordUSA
  2. 2.Argonne National LaboratoryArgonneUSA
  3. 3.Laboratory of Nuclear StudiesCornell UniversityIthacaUSA

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