Nucleon QCD sum rules in instanton vacuum
High Energy Physics - Phenomenology
2014-07-11 v1
Abstract
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 w_s \approx 2/3.
Keywords
Cite
@article{arxiv.1407.2749,
title = {Nucleon QCD sum rules in instanton vacuum},
author = {E. G. Drukarev and V. A. Sadovnikova},
journal= {arXiv preprint arXiv:1407.2749},
year = {2014}
}
Comments
23 pages, 7 figures. arXiv admin note: text overlap with arXiv:1312.1449