Flavour-conserving oscillations of Dirac-Majorana neutrinos

Details Flavour-conserving oscillations of Dirac-Majorana neutrinos Flavour-conserving oscillations of Dirac-Majorana neutrinos

1998-02-17

arxiv.org/abs/hep-ph/9802336v1

Int.J.Mod.Phys. A13 (1998) 5023-5036

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages, latex 2E, no figures

Scientific paper

10.1142/S0217751X98002341

We analyze both chirality-changing and chirality-preserving transitions of Dirac-Majorana neutrinos. In vacuum, the first ones are suppressed with respect to the others due to helicity conservation and the interactions with a (``normal'') medium practically does not affect the expressions of the probabilities for these transitions, even if the amplitudes of oscillations slightly change. For usual situations involving relativistic neutrinos we find no resonant enhancement for all flavour-conserving transitions. However, for very light neutrinos propagating in superdense media, the pattern of oscillations $\nu_L \to \nu^C_L$ is dramatically altered with respect to the vacuum case, the transition probability practically vanishing. An application of this result is envisaged.

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