Direct Instantons in QCD Nucleon Sum Rules

Abstract

We study the role of direct (i.e. small-scale) instantons in QCD correlation functions for the nucleon. They generate sizeable, 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.

10 pages, UMD PP#93-172

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• Scalar Gluonium and Instantons
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• Calculation of $<p|\overline{u}u-\overline{d}d|p>$ from QCD sum rule and the neutron-proton mass difference
• Analysis of the X(1576) as a tetraquark state with the QCD sum rules
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• Triquark correlations and pentaquarks in a QCD sum rule approach
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• Isospin Breaking and Instantons in QCD Nucleon Sum Rules
• Instanton contributions to the low-lying hadron mass spectrum
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