MU-CHUN CHEN
Theoretical Physics Department, Fermi National Accelerator Laboratory, Batavia, IL 60510, USA
SALLY DAWSON
High Energy Theory Group, Brookhaven National Laboratory, Upton, New York 11973, USA
TADAS KRUPOVNICKAS
High Energy Theory Group, Brookhaven National Laboratory, Upton, New York 11973, USA

Received 20 December 2005

Electroweak precision data have been extensively used to constrain models containing physics beyond that of the Standard Model (SM). When the model contains Higgs scalars in representations other than singlets or doublets, and hence ρ≠1 at tree-level, a correct renormalization scheme requires more inputs than the three commonly used for the SM case. In such cases, the one-loop electroweak results cannot be split into a SM contribution plus a piece which vanishes as the scale of new physics becomes much larger than M_W. We illustrate our results by presenting the dependence of M_W on the top-quark mass in a model with a Higgs triplet and in the SU(2)_L × SU(2)_R left–right symmetric model. In these models, the allowed range for the lightest neutral Higgs mass can be as large as a few TeV.

Beyond Standard Model; Higgs physics
PACS numbers: 14.80.Cp, 12.15.Lk