Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-03-17
Phys.Rev. D73 (2006) 073004
Physics
High Energy Physics
High Energy Physics - Phenomenology
To appear in Phys. Rev. D
Scientific paper
10.1103/PhysRevD.73.073004
We perform a systematic analysis of the PMNS matrices which arise when one assigns the three generations of leptons to the $2\oplus 1$ representation of a horizontal $SU_H(2)$ symmetry. This idea has been previously explored by Kuchimanchi and Mohapatra. However, we assume $(i)$ the neutrino mass matrix results from leptonic couplings to $SU_L(2)$ triplet scalar fields and $(ii)$ hierarchies exist amongst lepton mass matrix elements which result from couplings to scalar fields with different $SU_H(2)$ charges. Of the sixteen candidate PMNS matrices which result it is found that only one is both predictive and possesses a leading order structure compatible with experimental data. The relevant neutrino mass matrix displays the symmetry $L_e-L_\mu-L_\tau$ to leading order and we explore the perturbations required to produce a realistic lepton spectrum. The effective mass in neutrinoless double beta decay is required to lie in the range $
McDonald Kristian L.
McKellar Bruce H. J.
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