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Title: Nucleon QCD sum rules in the instanton medium

We try to find grounds for the standard nucleon QCD sum rules, based on a more detailed description of the QCD vacuum. We calculate the polarization operator of the nucleon current in the instanton medium. The medium (QCD vacuum) is assumed to be a composition of the small-size instantons and some long-wave gluon fluctuations. We solve the corresponding QCD sum rule equations and demonstrate that there is a solution with the value of the nucleon mass close to the physical one if the fraction of the small-size instantons contribution is w{sub s} ≈ 2/3.
Authors:
; ;  [1]
  1. Konstantinov Petersburg Nuclear Physics Institute, National Research Center “Kurchatov Institute,” (Russian Federation)
Publication Date:
OSTI Identifier:
22472081
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Experimental and Theoretical Physics; Journal Volume: 121; Journal Issue: 3; Other Information: Copyright (c) 2015 Pleiades Publishing, Inc.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; FIELD OPERATORS; FLUCTUATIONS; GLUONS; INSTANTONS; MATHEMATICAL SOLUTIONS; NUCLEONS; POLARIZATION; QUANTUM CHROMODYNAMICS; REST MASS; SUM RULES