Electroweak Precision Constraints on Vector-like Fermions

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dc.creatorCynolter, G.
dc.creatorLendvai, E.
dc.date2008-04-25
dc.date2008-06-23
dc.date.accessioned2026-07-07T12:14:27Z
dc.date.available2026-07-07T12:14:27Z
dc.descriptionWe 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.
dc.description11 pages, 3 figures, references added,sign correction, conclusion about heavy Higgs has changed
dc.identifierhttps://arxiv.org/abs/0804.4080
dc.identifierhttp://arxiv.org/abs/0804.4080
dc.identifierEur.Phys.J.C58:463-469,2008
dc.identifierdoi:10.1140/epjc/s10052-008-0771-7
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/211194
dc.subjectHigh Energy Physics - Phenomenology
dc.titleElectroweak Precision Constraints on Vector-like Fermions
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