Mapping Dirac gaugino masses

TL;DR

This paper explores how Dirac gaugino masses map through strong coupling regions in SQCD with an adjoint, establishing an RG-invariant relation under Kutasov duality and using N=2 techniques to understand their behavior.

Contribution

It provides a novel mapping of Dirac gaugino masses across dual descriptions in strongly coupled SQCD, utilizing N=2 deformations and harmonic superspace methods.

Findings

RG-invariant relation for Dirac masses under duality

Demonstration of N=2 deformation flow to N=1 theories

Dirac masses can be induced via FI-terms in N=2 frameworks

Abstract

We investigate the mapping of Dirac gaugino masses through regions of strong coupling, focussing on SQCD with an adjoint. These models have a well-known Kutasov duality, under which a weakly coupled electric UV description can flow to a different weakly coupled magnetic IR description. We provide evidence to show that Dirac gaugino mass terms map as lim_{mu->infty} mD/(g kappa^{1/(k+1}} = lim_{mu->0} tilde{mD}/(tilde{g} tilde{kappa}^{1/(k+1}} under such a flow, where the coupling kappa appears in the superpotential of the canonically normalised theory as W \supset kappa X^{k+1}. This combination is an RG-invariant to all orders in perturbation theory, but establishing the mapping in its entirety is not straightforward because Dirac masses are not the spurions of holomorphic couplings in the N=1 theory. To circumvent this, we first demonstrate that deforming the Kutasov theory can make it flow to an N=2 theory with parametrically small N=1 deformations. Using harmonic superspace techniques we then show that the N=1 deformations can be recovered from electric and magnetic FI-terms that break N=2 -> N=1, and also show that pure Dirac mass terms can be induced by the same mechanism. We then find that the proposed RG-invariant is indeed preserved under N=2 duality, and thence along the flow to the dual N=1 Kutasov theories. Possible phenomenological applications are discussed.