Electroweak Precision Constraints on Vector-like Fermions

Details Electroweak Precision Constraints on Vector-like Fermions Electroweak Precision Constraints on Vector-like Fermions

2008-04-25

arxiv.org/abs/0804.4080v2

Eur.Phys.J.C58:463-469,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, 3 figures, references added,sign correction, conclusion about heavy Higgs has changed

Scientific paper

10.1140/epjc/s10052-008-0771-7

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.

Affiliated with

Also associated with

No associations

Rating

Electroweak Precision Constraints on Vector-like Fermions does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Electroweak Precision Constraints on Vector-like Fermions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electroweak Precision Constraints on Vector-like Fermions will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-728123