Improvement via hypercubic smearing in triplet and sextet QCD

Abstract

We study non-perturbative 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 Schroedinger-functional techniques we estimate the clover coefficient Csw and find that discretization errors are much smaller than in thin-link theories.

Comments: 4 pages, 2 figures; v3: The analysis has been extensively revised. Conclusions are the same. Final version