  We study spin and spin-flavor oscillations of Dirac neutrinos in a plane
electromagnetic wave with circular polarization. The evolution of massive
neutrinos with nonzero magnetic moments in the field of an electromagnetic wave
is based on the exact solution of the Dirac-Pauli equation. We formulate the
initial condition problem to describe spin-flavor oscillations in an
electromagnetic wave. The transition probabilities for spin and spin-flavor
oscillations are obtained. In case of spin-flavor oscillations, we analyze the
transition and survival probabilities for different neutrino magnetic moments
and various channels of neutrino oscillations. As an application of the
obtained results, we study the possibility of existence of
$\nu_{e\mathrm{L}}\to\nu_{\mu\mathrm{R}}$ oscillations in an electromagnetic
wave emitted by a highly magnetized neutron star. Our results are compared with
findings of other authors.

High Energy Physics - Phenomenology