Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-11-12
Nucl.Phys.B847:567-589,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
32 pages, 9 figures, the estimation of relic abundance of LSP improved and 4 figures replaced, conclusions unchanged, typos co
Scientific paper
10.1016/j.nuclphysb.2011.02.007
The existence of an anomalous U(1) symmetry is shown to play a crucial role in the supersymmetric radiative seesaw model for neutrino masses. It explains the smallness of some couplings related to neutrino mass generation in a favorable way in addition to cause the hierarchical structure of Yukawa couplings of quarks and leptons. If it is spontaneously broken to a $Z_2$ subgroup, this $Z_2$ symmetry can make a lifetime of the lightest field with its odd parity extremely long. Thus, the model has an additional dark matter candidate other than the lightest neutralino, which appears in the $R$-parity conserved MSSM. We discuss the nature of dark matter by taking account of its relation to the neutrino mass generation and the lepton flavor violation.
Suematsu Daijiro
Toma Takashi
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