2014/07/10 by E. G. Drukarev, Drukarev, E. G., V. A. Sadovnikova +1 · 1 citation
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Particle physics theoretical and experimental studies #hep-ph
paper · pdf · doi:10.48550/arxiv.1407.2749
23 pages, 7 figures. arXiv admin note: text overlap with arXiv:1312.1449
arxiv created 2014/07/10 · arxiv updated 2014/07/11
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 instantons of large and small sizes. The former are described in terms of the local scalar condensate, while the latter can be interpreted as the nonlocal scalar condensate. We solve the corresponding QCD sum rules 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 ws ≈ 2/3.