Isospin Breaking and Instantons in QCD Nucleon Sum Rules

Details Isospin Breaking and Instantons in QCD Nucleon Sum Rules Isospin Breaking and Instantons in QCD Nucleon Sum Rules

1996-11-12

arxiv.org/abs/hep-ph/9611311v1

Phys.Rev. D55 (1997) 1471-1480

Physics

High Energy Physics

High Energy Physics - Phenomenology

28 pages, REVTEX file and 5 Postscript figures

Scientific paper

10.1103/PhysRevD.55.1471

We study isospin breaking instanton corrections to the operator product expansion of the nucleon correlation functions. After a comparison with quark model calculations based on the 't Hooft interaction, we examine the role of instantons in the corresponding QCD sum rules. Instanton contributions are found to be absent in the chirally even sum rule, but significant in the chirally-odd one. They improve the consistency of both sum rules and favor a value of the isovector quark condensate close to the chiral estimate.

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