Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-10-24
Phys.Lett.B524:153-160,2002
Physics
High Energy Physics
High Energy Physics - Phenomenology
17 pages, no figures, references added, to be published in PLB
Scientific paper
10.1016/S0370-2693(01)01356-9
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 \geq 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.
Balaji K. R. S.
Kalliomäki Anna
Maalampi Jukka
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