Neutrinos and Structure of the Intermediate Mass Scale

Details Neutrinos and Structure of the Intermediate Mass Scale Neutrinos and Structure of the Intermediate Mass Scale

1995-11-05

arxiv.org/abs/hep-ph/9511239v1

Nucl.Phys. B466 (1996) 25-40

Physics

High Energy Physics

High Energy Physics - Phenomenology

19 pages, LaTeX, no figures

Scientific paper

10.1016/0550-3213(96)00084-3

Neutrino data lead via the see-saw mechanism to masses of the right handed neutrinos at the intermediate mass scale. Simple formalism is suggested which incorporates the quark - lepton symmetry and allows one to find properties of the intermediate scale (masses and mixing) from neutrino data. Averaged mass scale and the mass hierarchy parameter are introduced and fixed by the data. They determine natural ranges of masses and mixing at the intermediate scale. In particular, scenario which includes the MSW solution of the solar neutrino problem and tau neutrino as the hot component of Dark Matter of the Universe leads to $M_2 = (2 - 4) \cdot 10^{10}$ GeV and $M_3 = (4 - 8) \cdot 10^{12}$ GeV in agreement with the linear mass hierarchy. Strong deviations from the natural ranges imply fine tuning of parameters or/and certain symmetry of the Majorana mass matrix of the right handed neutrinos.

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