3+2 neutrino scheme from a singular double seesaw mechanism
- School of Physics, Research Centre for High Energy Physics, University of Melbourne, Victoria, 3010 (Australia)
We obtain a 3+2 neutrino spectrum within a left-right symmetric framework by invoking a singular double seesaw mechanism. Higgs doublets are employed to break SU{sub 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}{sub {alpha}}{sub L}, {alpha}=e,{mu},{tau}, separated from two neutrinos containing a small {nu}{sub {alpha}}{sub L} component. The resulting active-sterile mixing in the 5x5 mixing matrix is specified once the mass eigenvalues and the 3x3 submatrix corresponding to the Pontecorvo-Maki-Nakagawa-Sakata (PMNS) mixing matrix are known.
- OSTI ID:
- 20705119
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 70, Issue 5; Other Information: DOI: 10.1103/PhysRevD.70.053012; (c) 2004 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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