TY  - GEN
ID  - heidok23871
AV  - public
UR  - https://archiv.ub.uni-heidelberg.de/volltextserver/23871/
Y1  - 2017///
N2  - 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.
A1  - Welter, Johannes Maria René
TI  - phenomenology of neutrino magnetic moments
ER  -