Exact Lattice Supersymmetry at the Quantum Level for $N=2$ Wess-Zumino Models in 1- and 2-Dimensions

TL;DR

This paper demonstrates that exact lattice supersymmetry can be maintained at the quantum level in 1- and 2-dimensional N=2 Wess-Zumino models using a super doubler approach, despite nonlocality and modified momentum conservation.

Contribution

It introduces a super doubler approach that preserves exact lattice supersymmetry at the quantum level for N=2 models in low dimensions.

Findings

Supersymmetric lattice Ward-Takahashi identities hold up to two-loop corrections.

Exact supersymmetry is realized for all supercharges at the quantum level.

The approach addresses chiral fermion doublers as physical particles.

Abstract

Supersymmetric lattice Ward-Takahashi identities are investigated perturbatively up to two-loop corrections for super doubler approach of $N=2$ lattice Wess-Zumino models in 1- and 2-dimensions. In this approach notorious chiral fermion doublers are treated as physical particles and momentum conservation is modified in such a way that lattice Leibniz rule is satisfied. The two major difficulties to keep exact lattice supersymmetry are overcome. This formulation defines, however, nonlocal field theory. Nevertheless we confirm that exact supersymmetry on the lattice is realized for all supercharges at the quantum level. Delicate issues of associativity are also discussed.