Journal or Book Title
Journal of High Energy Physics
We study the large N θ dependence and the η ′ potential in supersymmetric QCD with small soft SUSY-breaking terms. Known exact results in SUSY QCD are found to reflect a variety of expectations from large N perturbation theory, including the presence of branches and the behavior of theories with matter (both with N f ≪ N and N f ∼ N ). However, there are also striking departures from ordinary QCD and the conventional large N description: instanton effects, when under control, are not exponentially suppressed at large N , and branched structure in supersymmetric QCD is always associated with approximate discrete symmetries. We suggest that these differences motivate further study of large N QCD on the lattice.
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Dine, Michael; Draper, Patrick; Stephenson-Haskins, Laurel; and Xu, Di, "θ and the η ′ in large N supersymmetric QCD" (2017). Journal of High Energy Physics. 1252.