# Neutrino flavor oscillations and spin rotation in matter and electromagnetic field

## TL;DR

This paper develops a covariant wave equation for neutrinos in matter and electromagnetic fields, describing flavor oscillations and spin rotation, and explores resonance phenomena related to neutrino properties.

## Contribution

It introduces a relativistically covariant wave equation encompassing both flavor oscillations and spin rotation, and analyzes resonance effects including a new magnetic-field resonance.

## Key findings

- Resonance behavior occurs only when flavor states are not superpositions of mass eigenstates.
- A resonance similar to MSW occurs in magnetic fields due to transition magnetic moments.
- This resonance can help determine if neutrinos are Dirac or Majorana particles.

## Abstract

We obtain a relativistically covariant wave equation for neutrinos in dense matter and electromagnetic field, which describes both flavor oscillations and neutrino spin rotation. Using this equation we construct a quasi-classical theory of these phenomena. We obtain the probabilities of arbitrary spin-flavor transitions assuming the external conditions to be constant. We demonstrate that the resonance behavior of the transition probabilities is possible only when the neutrino flavor states cannot be described as superpositions of the mass eigenstates. We discover that a resonance, which is similar to the Mikheev-Smirnov-Wolfenstein resonance, takes place for neutrinos in magnetic field due to the transition magnetic moments. This resonance gives an opportunity to determine, whether neutrinos are Dirac or Majorana particles.