Back to Search
Start Over
Electroweak Precision Constraints on Vector-like Fermions
- Source :
- Eur.Phys.J.C58:463-469,2008
- Publication Year :
- 2008
-
Abstract
- We calculate the oblique electroweak corrections and confront with the experiments in an extension of the Standard Model. The new fields added are a vector-like weak doublet and a singlet fermion. After electroweak symmetry breaking there is a mixing between the components of the new fields, but no mixing allowed with the standard fermions. Four electroweak parameters, $\hat{S}$, $\hat{T}$, W, Y are presented in the formalism of Barbieri et al., these are the generalization of the Peskin-Takeuchi S, T, U's. The vector-like extension is slightly constrained, $\hat{T}$ requires the new neutral fermion masses not to be very far from each other, allowing higher mass difference for higher masses and smaller mixing. $\hat{S}, W, Y$ gives practically no constraints on the masses. This extension can give a positive contribution to $\hat{T} $, allowing a heavy Higgs boson in electroweak precision tests of the Standard Model.<br />Comment: 11 pages, 3 figures, references added,sign correction, conclusion about heavy Higgs has changed
- Subjects :
- High Energy Physics - Phenomenology
Subjects
Details
- Database :
- arXiv
- Journal :
- Eur.Phys.J.C58:463-469,2008
- Publication Type :
- Report
- Accession number :
- edsarx.0804.4080
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1140/epjc/s10052-008-0771-7