NUCLEON QCD SUM RULES IN THE INSTANTON MEDIUM
Ryskin M.G., Drukarev E.G., Sadovnikova V.A.

Received: April 3, 2015

DOI: 10.7868/S0044451015090059

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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 .