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

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 γwithin 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.

22 pages, 5 figures

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• keV sterile neutrino dark matter in gauge extensions of the standard model
• Lepton Flavour Violating Decays tau to lll and mu to e gamma in the Higgs Triplet Model
• Left-Right Symmetry: from Majorana to Dirac
• Neutrino masses, leptogenesis, and sterile neutrino dark matter
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• Lower Limits on $\mu \to e\gamma$ from new Measurements on $U_{e3}$
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• Generalised Casas-Ibarra Parametrisation for Majorana Neutrino Masses