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We study dynamics of SU (N-4) gauge theories with fermions in rank-2 symmetric tensor and N antifundamental representations, by perturbing supersymmetric theories with anomaly-mediated supersymmetry breaking. We find the SU (N) (1) global symmetry is dynamically broken to SO (N) for N17, a different result from conjectures in the literature. For N<17, the theory initially flows to a superconformal fixed point, but is diverted by the soft masses, which act as a relevant perturbation.
Csáki et al. (Mon,) studied this question.