Systematic study of the single instanton approximation in QCD

Jun, 2001
11 pages
Published in:
  • Phys.Rev.D 64 (2001) 114020
e-Print:

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Abstract:
The Single-instanton approximation (SIA) is often used to evaluate analytically instanton contribution to euclidean correlation functions in QCD, at small distances. We discuss how this approximation can be consistently derived from the theory of the instanton ensemble and give precise definitions to a number of different "effective masses", generalizing the parameter mm*, which was introduced long ago to account for the collective contribution of the whole ensemble. We test numerically the range of applicability of the SIA for different quantities. Furthermore, we determine all the effective masses (for random and interacting instanton liquid models) as well as from phenomenology, and discuss to what extent those are universal.
  • quantum chromodynamics
  • instanton: liquid
  • quark: propagator
  • quark: mass
  • pi: two-point function
  • diquark: two-point function
  • nucleon: two-point function
  • numerical calculations