XXVIth International Baldin Seminar on High Energy Physics Problems "Relativistic Nuclear Physics and Quantum Chromodynamics"

Quantum field theory description of neutrino spin-flavor oscillations

16 Sept 2025, 16:50

20m

LHEP-215/347 - комната семинаров (VBLHEP)

20 min. Polarization phenomena, spin physics Polarization phenomena, spin physics

Speaker

Dvornikov, Maxim (IZMIRAN)

Description

We study spin-flavor oscillations of neutrinos in a magnetic field within the quantum field theory approach in which neutrinos are virtual particles. Neutrinos are taken to be Majorana particles having a nonzero transition magnetic moment. We derive the dressed propagators of the neutrino mass eigenstates exactly accounting for the magnetic field contribution. The matrix element and the transition probability for spin-flavor oscillations are obtained. The leading term in the transition probability is shown to coincide with the result of the standard quantum mechanical description of neutrino oscillations. We also derive the correction to the transition probability which has the quantum field theory origin.