Flavour transitions of Dirac-Majorana neutrinos

Physics – High Energy Physics – High Energy Physics - Phenomenology

Scientific paper

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latex 2e, 19 pages, 1 figure; to be published in The European Journal of Physics C

Scientific paper

10.1007/s100520050199

From a phenomenological point of view, we study active-active and active-sterile flavour-changing (and flavour-conserving) oscillations of Dirac-Majorana neutrinos both in vacuum and in matter. The general expressions for the transition probabilities in vacuum are reported. We then investigate some interesting consequences following from particular simple forms of the neutrino mass matrices, and for the envisaged scenarios we discuss in detail neutrino propagation in matter. Special emphasis is given to the problem of occurrence of resonant enhancement of active-active and active-sterile neutrino oscillations in a medium. The peculiar novel features related to the Dirac-Majorana nature of neutrinos are particularly pointed out.

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