Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-08-05
JHEP0410:010,2004
Physics
High Energy Physics
High Energy Physics - Phenomenology
25 pages, 3 figures; very minor changes, some references added
Scientific paper
10.1088/1126-6708/2004/10/010
It is well known that technicolor models in which the electroweak symmetry is broken by QCD-like strong dynamics at the TeV scale generally predict unacceptably large corrections to low-energy observables. We investigate the models of electroweak symmetry breaking by strong dynamics in which the gauge symmetry is extended to include an arbitrary number of additional SU(2) and U(1) factors. This class of models includes the deconstructed version of the recently proposed five-dimensional "Higgsless" scenario. We conclude that the additional structure present in these theories does not suppress the effects of strongly coupled short-distance physics on the precision electroweak observables. In particular, the possibility that the symmetry breaking is due to QCD-like dynamics is still strongly disfavored by data.
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