Confining vs. conformal scenario for SU(2) with adjoint fermions. Gluonic observables

Preprint number: CP3-Origins-2010-47
Authors: Luigi Del Debbio (University of Edinburgh), Biagio Lucini (Swansea University), Agostino Patella (Swansea University), Claudio Pica (CP³-Origins), and Antonio Rago (Bergische Universität Wuppertal)
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Walking technicolor is a mechanism for electroweak symmetry breaking without Higgs field. The Higgs mechanism is provided by chiral symmetry breaking in the technicolor theory. An essential ingredient is the vicinity to an IR fixed point, which could reconcile technicolor with the electroweak precision tests. SU(2) gauge theory with two Dirac adjoint fermions has been proposed as a candidate for walking technicolor. Understanding whether this theory is confining or IR-conformal is a challenging problem, which can be addressed by means of numerical simulations. We have pointed out that a clean signal for the existence of an IR fixed point in this theory can be obtained by comparing the mesonic and gluonic sectors. We review some technical details of our calculations. Possible systematic errors are discussed.