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An SU(2) gauge theory with two fermions transforming under the adjointrepresentation of the gauge group may appear conformal or almost conformal inthe infrared. We use lattice simulations to study the spectrum of this theoryand present results on the masses of several gauge singlet states as a functionof the physical quark mass determined through the axial Ward identity and findindications of a change from chiral symmetry breaking to a phase consistentwith conformal behaviour at beta_L ~ 2. However, the measurement of thespectrum is not alone sufficient to decisively confirm the existence ofconformal fixed point in this theory as we show by comparing to similarmeasurements with fundamental fermions. Based on the results we sketch apossible phase diagram of this lattice theory and discuss the applicability andimportance of these results for the future measurement of the evolution of thecoupling constant.

Spectrum of SU(2) lattice gauge theory with two adjoint Dirac flavours