Background Field Method and Structure of Effective Action in N=2 Super Yang-Mills Theories

Abstract

This paper is a brief review of background field method and some of its applications in N=2 super Yang-Mills theories with a matter within harmonic superspace approach. A general structure of effective action is discussed, an absence of two-loop quantum corrections to first non-leading term in effective action is proved and N=2 non-renormalization theorem in this approach is considered.

7 pages, 1 figure. The extended talk given by I.L. Buchbinder at 31st International Ahrenshoop Symposium on the Theory of Elementary Particles, Buckow, Germany, 2-6 September 1997, will be published in the Proceedings