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Improving Electro-Weak Fits with TeV-scale Sterile Neutrinos

MPG-Autoren
http://pubman.mpdl.mpg.de/cone/persons/resource/persons30246

Akhmedov,  Evgeny Kh.
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons30768

Lindner,  Manfred
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons81219

Michaels,  Lisa
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons37979

Smirnov,  Juri
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

Volltexte (frei zugänglich)

1302.1872.pdf
(Preprint), 933KB

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Zitation

Kartavtsev, A., Akhmedov, E. K., Lindner, M., Michaels, L., & Smirnov, J. (2013). Improving Electro-Weak Fits with TeV-scale Sterile Neutrinos. Journal of high energy physics: JHEP, 2013(05): 081. doi:10.1007/JHEP05(2013)081.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0013-F5DF-8
Zusammenfassung
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.