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Phenomenological Consequences of sub-leading Terms in See-Saw Formulas · Around

2011

Phenomenological Consequences of sub-leading Terms in See-Saw Formulas

Hettmansperger, Hans, Lindner, Manfred, Rodejohann, Werner

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Several aspects of next-to-leading (NLO) order corrections to see-saw formulas are discussed and phenomenologically relevant situations are identified.

We generalize the formalism to calculate the NLO terms developed for the type I see-saw to variants like the inverse, double or linear see-saw, i.e., to cases in which more than two mass scales are present.
In the standard type I case with very heavy fermion singlets the sub-leading terms are negligible.
However, effects in the percent regime are possible when sub-matrices of the complete neutral fermion mass matrix obey a moderate hierarchy, e.g.

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