title: phenomenology of neutrino magnetic moments
creator: Welter, Johannes Maria René
subject: ddc-530
subject: 530 Physics
description: 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
type: Dissertation
type: info:eu-repo/semantics/doctoralThesis
type: NonPeerReviewed
format: application/pdf
identifier: https://archiv.ub.uni-heidelberg.de/volltextserverhttps://archiv.ub.uni-heidelberg.de/volltextserver/23871/1/Dissertation_Welter_2017-10-08.pdf
identifier: DOI:10.11588/heidok.00023871
identifier: urn:nbn:de:bsz:16-heidok-238712
identifier:   Welter, Johannes Maria René  (2017) phenomenology of neutrino magnetic moments.  [Dissertation]     
relation: https://archiv.ub.uni-heidelberg.de/volltextserver/23871/
rights: info:eu-repo/semantics/openAccess
rights: http://archiv.ub.uni-heidelberg.de/volltextserver/help/license_urhg.html
language: eng