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Neutrinos and Dark Matter Within an Extended Zee-Babu Model


Schmidt,  Daniel
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

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Schmidt, D. (2010). Neutrinos and Dark Matter Within an Extended Zee-Babu Model. Diploma Thesis, Ruprecht-Karls-Universität, Heidelberg.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-72D5-2
Extensions of the Zee-Babu model are investigated to find a common framework for the neutrino mass problem and the dark matter issue of the universe. The particle content of the model is enlarged with a complex scalar singlet φ and a right-handed Majorana neutrino NR which serves as a particle dark matter candidate. With a speci c baryon (B) minus lepton (L) number for φ, the model enjoys a U(1) B-L symmetry. In a fi rst scenario, the U(1)B-L is gauged. To prevent [U(1)B-L3 gauge anomalies, NR is a must. In a second scenario, a Z4 symmetry is imposed. U(1)B-L is global, i.e., a Majoron enters into the theory after spontaneous symmetry breaking. In both scenarios, light neutrino masses and the dark matter mass are generated at the U(1)B-L symmetry breaking scale.The required thermal relic abundance of NR is predominantly produced through the Higgs portal. It is shown that NR could be directly detected. To complete, the veri cation of the model at the LHC is discussed.