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Revisiting pseudo-Dirac neutrinos by K.R.S. Balaji; Anna Kalliomäki; Jukka Maalampi is a Physics and Astronomy article available to read on EtoBox.

What is Revisiting pseudo-Dirac neutrinos about?

We study the pseudo-Dirac mixing of left-and right-handed neutrinos in the case where the Majorana masses M L and M R are small when compared with the Dirac mass, M D . The light Majorana masses could be generated by a non-renormalizable operator reflecting effects of new physics at some high energy scale. In this context, we obtain a simple model independent closed bound for M D . A phenomenologically consistent scenario is achieved with M L , M R 10 -7 eV and M D 10 -5 -10 -4 eV. This precludes the possibility of positive mass searches in the planned future experiments like GENIUS or in tritium decay experiments. If on the other hand, GENIUS does observe a positive signal for a Majorana mass 10 -3 eV, then with very little fine tuning of neutrino parameters, the scale of new physics could be in the TeV range, but pseudo-Dirac scenario in that case is excluded. We briefly discuss the constraints from cosmology when a fraction of the dark matter is composed of nearly degenerate neutrinos.

Who reads Revisiting pseudo-Dirac neutrinos?

Author

K.R.S. Balaji; Anna Kalliomäki; Jukka Maalampi

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0370-2693)

Published

2002

Language

EN

Field

Physics and Astronomy (Physical Sciences)