Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-04-22
Phys.Lett. B568 (2003) 245-253
Physics
High Energy Physics
High Energy Physics - Phenomenology
12 pages, 2 figures
Scientific paper
10.1016/j.physletb.2003.06.047
A definition of the rho parameter based on the Higgs couplings with the gauge bosons, rho_h= g_{hWW}}/c^2_W g_{hZZ}, is proposed as a new probe into the origin of the mechanism of electroweak symmetry breaking. While $\rho_h=1$ holds in the SM, deviations from one are predicted in models with extended Higgs sector. We derive a general expresion of rho_h for a model with arbitrary Higgs multiplets, and discuss its size within the context of specific models with Higgs triplets, including the ``Little Higgs'' models recently proposed. We find the even for Higgs models that incorporate the custodial symmetry to make rho=1, one could have rho_h\neq 1, which could be tested at the level of a few percent, with the precision Higgs meassurements expected at the NLC.
Diaz-Cruz Lorenzo J.
Lopez-Falcon D. A.
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