On SQCD with massive and massless flavors

TL;DR

This paper analyzes the vacuum structure of supersymmetric QCD with mixed massive and massless flavors, revealing destabilization at the origin and absence of metastable SUSY breaking, supported by two-loop calculations and string theory embeddings.

Contribution

It provides a detailed two-loop analysis of SQCD with both massive and massless flavors, showing the destabilization of the origin and linking field theory results with string theory brane dynamics.

Findings

The origin is destabilized at two loops, preventing metastable SUSY breaking.

Embedding in string theory reproduces the destabilization, confirming the field theory results.

Hierarchy among flavors can lead to instabilities in both field and string descriptions.

Abstract

We consider supersymmetric QCD in the free magnetic phase with massless and massive flavors. The theory has a supersymmetry breaking pseudo-moduli space of vacua and a runaway behavior far away from the origin. A two-loop computation reveals that the origin is destabilized and there is no meta-stable SUSY breaking solution. We also study the embedding of this model in type IIA string theory and find evidence for similar behavior. The perturbative brane dynamics involves simple interactions between branes, correctly predicting the two-loop result in the gauge theory. Our results also apply to the case when all the flavors are massive but have hierarchy among them, leading to possible instability which is manifest both in field theory and the brane description.