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Lattice formulation of two-dimensional \({\mathcal N}=(2,2)\) SQCD with exact supersymmetry. (English) Zbl 1192.81348

Summary: We construct a lattice model for two-dimensional \({\mathcal N}=(2,2)\) supersymmetric QCD (SQCD), with the matter multiplets belonging to the fundamental or anti-fundamental representation of the gauge group \(U(N)\) or \(SU(N)\). The construction is based on the topological field theory (twisted supercharge) formulation and exactly preserves one supercharge along the line of the papers [The author, JHEP 0401, 015 (2004), JHEP 0403, 067 (2004), F. JHEP 0501 016 (2005), Phys. Lett. B 635, 218 (2006) ] for pure supersymmetric Yang-Mills theories. In order to avoid the species doublers of the matter multiplets, we introduce the Wilson terms and the model is defined for the case of the number of the fundamental matters \((n_{+})\) equal to that of the anti-fundamental matters \((n_{ - })\). If some of the matter multiplets decouple from the theory by sending the corresponding anti-holomorphic twisted masses to the infinity, we can analyze the general \(n_{+}\not= n_{ - }\) case, although the lattice model is defined for \(n_{+}=n_{ - }\). By computing the anomaly of the \(U(1)_A\) R-symmetry in the lattice perturbation, we see that the decoupling is achieved and the anomaly for \(n_{+}\not= n_{ - }\) is correctly obtained.

MSC:

81V05 Strong interaction, including quantum chromodynamics
81T13 Yang-Mills and other gauge theories in quantum field theory
81T60 Supersymmetric field theories in quantum mechanics
81T45 Topological field theories in quantum mechanics
81T25 Quantum field theory on lattices

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