Some results on the BESS model at future colliders

colliders in the TeV range to test the idea of a strongly interactingsector as responsible for the electroweak symmetry breaking.The calculations are performed within an effective lagrangian description, called theBESS model, which provides for a rather general frame based on the standing point ofcustodial symmetry and gauge invariance, without specifying any dynamical scheme.We are interested in studying a spontaneous symmetry breaking avoiding physicalscalar particles, i.e. in a non linear rather than in a linear way. An effective lagrangiandescribing in an unified way mass terms and interactions of the standard electroweakgauge bosons has been derived [1] as a gauged non linear σ-model.Using extensively the fact that any non linear σ-model is gauge equivalent to theo-ries with additional hidden local symmetry [2], we can build up new vector resonances,similar to ordinary ρ vector mesons or to the techni-ρ particle of technicolor theories, asthe gauge bosons associated to the hidden symmetry group of SU(2) type. Under the as-sumption they are dynamical, we will get the SU(2) BESS lagrangian [1] (BESS standingfor Breaking Electroweak Symmetry Strongly).Therefore the minimal BESS model is described by a Yang Mills lagrangian whosegauge group is SU(2)