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Improving electro-weak fits with TeV-scale sterile neutrinos
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Journal Article
Improving electro-weak fits with TeV-scale sterile neutrinos
2013
Overview
A
bstract
We study the impact of TeV-scale sterile neutrinos on electro-weak precision observables and lepton number and flavour violating decays in the framework of a type-I see-saw extension of the Standard Model. At tree level sterile neutrinos manifest themselves via non-unitarity of the PMNS matrix and at one-loop level they modify the oblique radiative corrections. We derive explicit formulae for the
S, T, U
parameters in terms of the neutrino masses and mixings and perform a numerical fit to the electro-weak observables. We find regions of parameter space with a sizable active-sterile mixing which provide a better over-all fit compared to the case where the mixing is negligible. Specifically we find improvements of the invisible
Z
-decay width, the charged-to-neutral-current ratio for neutrino scattering experiments and of the deviation of the
W
boson mass from the theoretical expectation.
Publisher
Springer-Verlag,Springer Nature B.V
