eprintid: 23871
rev_number: 18
eprint_status: archive
userid: 3508
dir: disk0/00/02/38/71
datestamp: 2018-01-04 08:12:36
lastmod: 2018-01-17 14:17:09
status_changed: 2018-01-04 08:12:36
type: doctoralThesis
metadata_visibility: show
creators_name: Welter, Johannes Maria René
title: phenomenology of neutrino magnetic moments
subjects: ddc-530
divisions: i-130001
divisions: i-851340
adv_faculty: af-13
abstract: The neutrino magnetic moment (NMM) in the Standard Model, minimally extended
allowing for massive neutrinos, is many orders of magnitude below current and expected
experimental sensitivities. A potential measurement would therefore strongly
hint to new physics beyond the Standard Model. It raises the question how a positive
NMM signal in future experiments could be explained in a theoretically consistent
way. After a brief theoretical introduction, we summarize existing experimental
bounds and systematically analyze the possibilities of model building for accommodating
large NMMs in beyond the Standard Model frameworks. As a by-product, we
derive new limits on millicharged particles from the non-observation of NMMs. The
tight connection of NMMs and neutrino masses generically leads to a fine-tuning
problem in typical models that predict sizable NMMs. We explicitly demonstrate
this problem using a model in which NMMs are proportional to neutrino masses.
Finally, we investigate mechanisms that provide large NMMs and at the same time
avoid the fine-tuning problem. As a result, we find only two such mechanisms that
are not yet excluded and in which large transition magnetic moments can be realized
for Majorana neutrinos only.
date: 2017
id_scheme: DOI
id_number: 10.11588/heidok.00023871
ppn_swb: 1658676106
own_urn: urn:nbn:de:bsz:16-heidok-238712
date_accepted: 2017-12-20
advisor: HASH(0x55a9a64a32b8)
language: eng
bibsort: WELTERJOHAPHENOMENOL2017
full_text_status: public
citation:   Welter, Johannes Maria René  (2017) phenomenology of neutrino magnetic moments.  [Dissertation]     
document_url: https://archiv.ub.uni-heidelberg.de/volltextserver/23871/1/Dissertation_Welter_2017-10-08.pdf