Helicity oscillations of Dirac and Majorana neutrinos

Abstract

The helicity of a Dirac neutrino with mass $m$ evolves under the influence of a $B$-field because it has a magnetic dipole moment proportional to $m$. Moreover, it was recently shown that a polarized or anisotropic medium engenders the same effect for both Dirac and Majorana neutrinos. Because a $B$-field polarizes a background medium, it instigates helicity oscillations even for Majorana neutrinos unless the medium is symmetric between matter and antimatter. Motivated by these observations, we review the impact of a $B$-field and of an anisotropic or polarized medium on helicity oscillations for Dirac and Majorana neutrinos from the common perspective of in-medium dispersion.

arXiv comment10 pages, 5 figures

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• Neutrino flavor oscillations and spin rotation in matter and electromagnetic field
• Neutrino spin oscillations in polarized matter
• Prospects for Neutrino Spin Coherence in Supernovae
• An optimization-based approach to calculating neutrino flavor evolution
• Collective Oscillations of Majorana Neutrinos in Strong Magnetic Fields and Self-induced Flavor Equilibrium
• Resonance enhancement of neutrino oscillations due to transition magnetic moments
• Geometric and Majorana phases in neutrino oscillations
• Neutrino spin and spin-flavour oscillations in transversally moving or polarized matter
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• A QFT-induced phase in neutrino flavour oscillations
• Neutrino spin operator and dispersion in moving matter
• Neutrino oscillation in the presence of background classical sources
• Spin rotation of neutrinos produced by compact magnetized astrophysical objects