Lattice artefacts in the Strongly Interacting theories
Models of Dynamical Electroweak Symmetry Breaking must display a quasi-conformal scaling behaviour in order to accomodate experimental constraints. The scaling properties of a theory can be studied using finite volume renormalization schemes. Among these, the most practical ones are based on the Schrodinger Functional (SF). However, SF schemes suffer from potentially large O(a) effects and special care has to be taken to remove these effets.
Here we will compare the standard setup of the SF with Wilson quarks to a setup with chirally rotated
boundary conditions. We study the step scaling function for SU(2) and SU(3) gauge groups in the fundamental, 2-index symmetric and adjoint representations. We perform the O(a)-improvement of both setups at 1-loop in perturbation theory, and we describe a way of minimizing higher order cutoff effects by an appropiate definition of the renormalised coupling.