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A Yukawa coupling parameterization for type I + II seesaw formula and applications to lepton flavor violation and leptogenesis

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Akhmedov,  Evgeny
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

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Rodejohann,  Werner
Werner Rodejohann - ERC Starting Grant, Junior Research Groups, MPI for Nuclear Physics, Max Planck Society;

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Citation

Akhmedov, E., & Rodejohann, W. (2008). A Yukawa coupling parameterization for type I + II seesaw formula and applications to lepton flavor violation and leptogenesis. Journal of High Energy Physics, JHEP06(2008): 106. doi:10.1088/1126-6708/2008/06/106.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-7925-3
Abstract
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.