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We discuss the lattice formulation of gauge theories with fermions inarbitrary representations of the color group, and present the implementation ofthe RHMC algorithm for simulating dynamical Wilson fermions. A first dataset ispresented for the SU(2) gauge theory with two fermions in the adjointrepresentation, which has been proposed as a possible technicolor candidate.Simulations are performed on 8^3x16 lattices, at fixed lattice spacing. ThePCAC mass, the pseudoscalar, vector and axial meson masses, the pseudoscalarmeson decay constant are computed. The extrapolation to the chiral limit isdiscussed. However more extensive investigations are needed in order to controlthe systematic errors in the numerical results, and then understand in detailthe phase structure of these theories.

Fermions in higher representations. Some results about SU(2) with adjoint fermions