Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-03-17
JHEP 0806:106,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
22 pages, 5 figures
Scientific paper
10.1088/1126-6708/2008/06/106
In the type I + II seesaw formula the mass matrix of light neutrinos m_nu receives contributions from the exchanges of both heavy Majorana neutrinos and SU(2)_L-triplet Higgs bosons. We propose a new parameterization for the Dirac-type Yukawa coupling matrix of neutrinos in this case, which generalizes the well known Casas-Ibarra parameterization to type I + II seesaw and is useful when the triplet term in m_nu is known. Neutrino masses and mixing, lepton flavor violation in decays like mu -> e \gamma within mSUGRA models and leptogenesis can then be studied within this framework. We illustrate the usefulness of our new parameterization using a number of simple examples.
Akhmedov Evgeny Kh.
Rodejohann Werner
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