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Journal Article

The neutrino magnetic moment portal: cosmology, astrophysics, and direct detection


Brdar,  Vedran
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

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Brdar, V., Greljo, A., Kopp, J., & Opferkuch, T. (2021). The neutrino magnetic moment portal: cosmology, astrophysics, and direct detection. Journal of Cosmology and Astroparticle Physics, (1): 039. doi:10.1088/1475-7516/2021/01/039.

Cite as: https://hdl.handle.net/21.11116/0000-000A-3E4E-B
We revisit the physics of neutrino magnetic moments, focusing in
particular on the case where the right-handed, or sterile, neutrinos are
heavier (up to several MeV) than the left-handed Standard Model
neutrinos. The discussion is centered around the idea of detecting an
upscattering event mediated by a transition magnetic moment in a
neutrino or dark matter experiment. Considering neutrinos from all known
sources, as well as including all available data from XENON1T and
Borexino, we derive the strongest up-to-date exclusion limits on the
active-to-sterile neutrino transition magnetic moment. We then study
complementary constraints from astrophysics and cosmology, performing,
in particular, a thorough analysis of BBN. We find that these data sets
scrutinize most of the relevant parameter space. Explaining the XENON1T
excess with transition magnetic moments is marginally possible if very
conservative assumptions are adopted regarding the supernova 1987 A and
CMB constraints. Finally, we discuss model-building challenges that
arise in scenarios that feature large magnetic moments while keeping
neutrino masses well below 1 eV. We present a successful
ultraviolet-complete model of this type based on TeV-scale leptoquarks,
establishing links with muon magnetic moment, B physics anomalies, and
collider searches at the LHC.