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1993•Physical Review LettersOpen access

Direct instantons in QCD nucleon sum rules

Hilmar Forkel, Manoj K. Banerjee

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Abstract

We study the role of direct (i.e., small-scale) instantons in QCD correlation functions for the nucleon. They generate sizable nonperturbative corrections to the conventional operator product expansion, which improve the quality of both QCD nucleon sum rules and cure the long-standing stability problem, in particular, of the chirally odd sum rule.

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We study the role of direct (i.e., small-scale) instantons in QCD correlation functions for the nucleon. They generate sizable nonperturbative corrections to the conventional operator product expansion, which improve the quality of both QCD nucleon sum rules and cure the long-standing stability problem, in particular, of the chirally odd sum rule.

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Available abstract

We study the role of direct (i.e., small-scale) instantons in QCD correlation functions for the nucleon. They generate sizable nonperturbative corrections to the conventional operator product expansion, which improve the quality of both QCD nucleon sum rules and cure the long-standing stability problem, in particular, of the chirally odd sum rule.

Key concepts: Sum rule in quantum mechanics, Instanton, Nucleon, Quantum chromodynamics, Physics, Operator product expansion, QCD sum rules, Particle physics

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