HiggsBoson Contributions to GaugeBoson Mass Shifts in Extended Electroweak Models.
Abstract
In the minimal standard model, the difference between the treelevel and oneloopcorrected predictions for the gaugeboson masses, known as the mass shifts, are of the order of 4%. The domi nant contribution is from lightfermion loops. The Higgsdependent terms are small, even if the Higgs boson is heavy. We have analyzed the mass shifts for models with a more compli cated Higgs sector. We use the onshell renormalization scheme, in which the parameters of the theory are the physical masses and couplings. We have considered the 2doublet, ndoublet, triplet and doublet triplet models. We have found that the Zboson mass pre  diction has a strong dependence on the chargedHiggs mass. In the limit that the charged Higgs is much heavier than the gauge bosons, the Higgsdependent terms become significant, and may even cancel the lightfermion terms. In the models with a Higgs triplet, there is also a strong dependence of the neutralHiggs masses, although this contribution tends to be suppressed in realistic models. The Wboson mass shift does not have a strong Higgs dependence. If we use the Z mass as input in determining the parameters of the theory, a scenario which will become attractive as the mass of the Z is accurately measured in the next few years, we find that the Wboson mass shift exhibits the same sort of behavior, differing from the minimal model for the case of the charged Higgs being heavy. We have found that when the radiative corrections are taken into account, models with extended Higgs sectors may differ significantly from the minimal standard model in their predictions for the gauge. boson masses. Thus, an accurate measurement of the masses will help shed light on the structure of the Higgs sector. *DOE Report IST1173. This work was performed under contract No. W7405Eng82 with the U.S. Department of Energy.
 Publication:

Ph.D. Thesis
 Pub Date:
 1985
 Bibcode:
 1985PhDT.......139M
 Keywords:

 Physics: Elementary Particles and High Energy