A bstract We revisit the study of singular points in the Coulomb branch of N = 2 $$ mathcal{N}=2 $$ SQCD in four dimensions with gauge group SU( N ). For certain choices of the mass parameters these vacua are not lifted by a mass term for the chiral multiplet in the adjoint representation. By using recent results about the M5 brane description of N = 1 $$ mathcal{N}=1 $$ theories we study the resulting vacua and argue that the low-energy effective theory has a simple Lagrangian description involving a free chiral multiplet in the adjoint representation of the flavor symmetry group, a system somewhat reminiscent of the standard low-energy pion description of the real-world QCD. This fact is quite remarkable in view of the fact that the underlying N = 2 $$ mathcal{N}=2 $$ SCFT (the Argyres-Douglas systems) are strongly-coupled non-local theories of quarks and monopoles.
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