Abstract
We study nonperturbative improvement in SU(3) lattice gauge theory coupled to fermions in the fundamental and two-index symmetric representations. Our lattice action is defined with hypercubic smeared links incorporated into the Wilson--clover fermion kernel. Using standard Schr\"odinger-functional techniques, we estimate the clover coefficient ${c}_{\mathrm{SW}}$ and find that discretization errors are much smaller than in thin-link theories.
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