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In the type I + II seesaw formula the mass matrix of light neutrinos m_nureceives contributions from the exchanges of both heavy Majorana neutrinos andSU(2)_L-triplet Higgs bosons. We propose a new parameterization for theDirac-type Yukawa coupling matrix of neutrinos in this case, which generalizesthe well known Casas-Ibarra parameterization to type I + II seesaw and isuseful 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 andleptogenesis can then be studied within this framework. We illustrate theusefulness of our new parameterization using a number of simple examples.

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