Low-energy dynamics in N = 2 super QED: Two-loop approximation
摘要
The two-loop (Euler-Heisenberg-type) effective action for N = 2 supersymmetric QED is computed using the N = 1 superspace formulation. The effective action is expressed as a series in supersymmetric extensions of F^{2n}, where n=2,3,..., with F the field strength. The corresponding coefficients are given by triple proper-time integrals which are evaluated exactly. As a by-product, we demonstrate the appearance of a non-vanishing F^4 quantum correction at the two-loop order. The latter result is in conflict with the conclusion of hep-th/9710142 that no such quantum corrections are generated at two loops in generic N = 2 SYM theories on the Coulomb branch. We explain a subtle loophole in the relevant consideration of hep-th/9710142 and re-derive the F^4 term from harmonic supergraphs.
关键词
引用
@article{arxiv.hep-th/0308136,
title = {Low-energy dynamics in N = 2 super QED: Two-loop approximation},
author = {S. M. Kuzenko and I. N. McArthur},
journal= {arXiv preprint arXiv:hep-th/0308136},
year = {2009}
}
备注
27 pages, latex, 4 EPS figures. V2: misprints corrected. V3: error in eq. (2.33) corrected, conclusions unchanged