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  Neutrinos and Abelian Gauge Symmetries

Heeck, J. (2014). Neutrinos and Abelian Gauge Symmetries. PhD Thesis, Ruprecht-Karls-Universität, Heidelberg.

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 Creators:
Heeck, Julian1, Author           
Rodejohann, Werner, Referee
Jaeckel, Jörg, Referee
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1Werner Rodejohann - ERC Starting Grant, Junior Research Groups, MPI for Nuclear Physics, Max Planck Society, ou_907556              

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 Abstract: We study the intimate connection between neutrinos and simple abelian gauge symmetries U(1), starting from the observation that the full global symmetry group of the Standard Model, G = U(1)B−L×U(1) Le−Lμ ×U(1) Lμ−Lτ , can be promoted to a local symmetry group by introducing three right-handed neutrinos—automatically making neutrinos massive. The unflavored part U(1)B−L is linked to the Dirac vs. Majorana nature of neutrinos; we discuss the B−L landscape—including leptonnumber- violating Dirac neutrinos—and implications for neutrinos, the baryon asymmetry, and experiments. Flavored subgroups U(1) ⊂ G can shed light on the peculiar leptonic mixing pattern and mass ordering; we show how normal, inverted, and quasi-degenerate mass hierarchy can arise from a U(1)′ in a simple and testable manner. We furthermore present all U(1) ⊂ G that can enforce viable texture zeros in the neutrino mass matrices. Beyond G, symmetries U(1)DM in the dark matter sector can give rise to naturally light sterile neutrinos, which provide a new portal between visible and dark sector, and also resolve some longstanding anomalies in neutrino experiments. Further topics under consideration are the mixing of vector bosons with the Z boson, as well as the Stuckelberg mechanism. The latter raises the question why the photon should be massless—or stable for that matter!

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 Dates: 2014-05-14
 Publication Status: Accepted / In Press
 Pages: 136 S. : Ill., graph. Darst.
 Publishing info: Heidelberg : Ruprecht-Karls-Universität
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 Degree: PhD

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