(3+2) Neutrino Scheme From A Singular Double See-Saw Mechanism

Details (3+2) Neutrino Scheme From A Singular Double See-Saw Mechanism (3+2) Neutrino Scheme From A Singular Double See-Saw Mechanism

2004-01-30

arxiv.org/abs/hep-ph/0401241v2

Phys.Rev. D70 (2004) 053012

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, matches published version

Scientific paper

10.1103/PhysRevD.70.053012

We obtain a 3+2 neutrino spectrum within a left-right symmetric framework by invoking a singular double see-saw mechanism. Higgs doublets are employed to break $SU_{R}(2)$ and three additional fermions, singlets under the left-right symmetric gauge group, are included. The introduction of a singularity into the singlet fermion Majorana mass matrix results in a light neutrino sector of three neutrinos containing predominantly $\nu_{\alpha L}$, $\alpha=e,\mu,\tau$, separated from two neutrinos containing a small $\nu_{\alpha L}$ component. The resulting active-sterile mixing in the $5\times 5$ mixing matrix is specified once the mass eigenvalues and the $3\times3$ submatrix corresponding to the MNS mixing matrix are known.

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