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Helicity oscillations of Dirac and Majorana neutrinos

Alexandra Dobrynina1,2, Alexander Kartavtsev2, and Georg Raffelt2

  • 1P. G. Demidov Yaroslavl State University, Sovietskaya 14, 150003 Yaroslavl, Russia
  • 2Max-Planck-Institut für Physik (Werner-Heisenberg-Institut), Föhringer Ring 6, 80805 München, Germany

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Phys. Rev. D 93, 125030 – Published 23 June, 2016

DOI: https://doi.org/10.1103/PhysRevD.93.125030

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.

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Phys. Rev. D 93, 125030– Published 23 June, 2016
  • Received 17 May 2016

© 2016 American Physical Society

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