2022 Impact factor 4.4
Particles and Fields
Eur. Phys. J. C 4, 221-230
DOI 10.1007/s100529800899

Flavour transitions of Dirac-Majorana neutrinos

Salvatore Esposito1 - Nicola Tancredi1

1 Dipartimento di Scienze Fisiche, Università di Napoli "Federico II'' Mostra d'Oltremare Pad. 19, I-80125 Napoli, Italy and Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, Mostra d'Oltremare Pad. 20, I-80125 Napoli, Italy

Received: 20 February 1998 / Published online: 5 June 1998

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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