eprintid: 16914
rev_number: 9
eprint_status: archive
userid: 1183
dir: disk0/00/01/69/14
datestamp: 2014-05-20 12:23:20
lastmod: 2014-05-21 07:00:45
status_changed: 2014-05-20 12:23:20
type: doctoralThesis
metadata_visibility: show
creators_name: Heeck, Julian
title: Neutrinos and Abelian Gauge Symmetries
divisions: 851340
adv_faculty: af-13
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) x U(1)(L_e-L_mu) x U(1)(L_mu-L_tau), 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 lepton-number-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 Stückelberg mechanism. The latter raises the question why the photon should be massless---or stable for that matter!

date: 2014
id_scheme: DOI
id_number: 10.11588/heidok.00016914
ppn_swb: 165755127X
own_urn: urn:nbn:de:bsz:16-heidok-169145
date_accepted: 2014-05-14
advisor: HASH(0x564e1c411a28)
language: eng
bibsort: HEECKJULIANEUTRINOSA2014
full_text_status: public
citation:   Heeck, Julian  (2014) Neutrinos and Abelian Gauge Symmetries.  [Dissertation]     
document_url: https://archiv.ub.uni-heidelberg.de/volltextserver/16914/1/heeck_thesis.pdf