Electroweak symmetry breaking after LEP1 and LEP2

Details Electroweak symmetry breaking after LEP1 and LEP2 Electroweak symmetry breaking after LEP1 and LEP2

2004-05-05

arxiv.org/abs/hep-ph/0405040v2

Nucl.Phys.B703:127-146,2004

Physics

High Energy Physics

High Energy Physics - Phenomenology

16 pages, 5 figures. Ref.s added, discussion of low energy observables improved

Scientific paper

10.1016/j.nuclphysb.2004.10.014

In a generic 'universal' theory of electroweak symmetry breaking, non fine-tuned heavy new physics affects the low-energy data through four parameters, which include and properly extend the generally insufficient S and T. Only by adding the LEP2 data to the global electroweak fit, can all these four form factors be determined and deviations from the SM be strongly constrained. Several of the recently proposed models (little Higgs, gauge bosons in extra dimensions or Higgsless models in 5D) are recognized to be 'universal' in a straightforward way after a proper definition of the effective vector boson fields. Among various applications, we show that proposed Higgsless models in 5D, when calculable, do not provide a viable description of electroweak symmetry breaking in their full range of parameters.

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