Effects of new physics to the the $ρ$--parameter in the supersymmetric standard model

Details Effects of new physics to the the $ρ$--parameter in the supersymmetric standard model Effects of new physics to the the $ρ$--parameter in the supersymmetric standard model

1993-09-07

arxiv.org/abs/hep-ph/9309233v1

Int. J. Mod. Phys. A10 (1995) 1765-1778

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages (5 figs), TIT/HEP-233, harvmac

Scientific paper

The contribution to the $\rho$--parameter of the quark--Higgs sector of the supersymmetric standard model is computed non--perturbatively using the large--$\nf$ expansion for the case tan$\beta$=0. An explicit formula is found for the $\rho$--parameter which is ill-defined unless the triviality cutoff is taken into account. The cutoff dependence of the $\rho$--parameter is found to be large if and only if the top mass is larger than $2v$ so that the cutoff scale is of the order of the electroweak scale. These non--universal effects are the reflections at low energies of the physics beyond the supersymmetric standard model. By also considering the effects of the soft--breaking terms, cutoff effects in both decoupling and non--decoupling effects are analyzed.

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