The formal seesaw mechanism of Majorana neutrinos with unbroken gauge symmetry

Abstract

We reformulate the canonical seesaw mechanism in the case that the electroweak gauge symmetry is unbroken, and show that it can "formally" work and allow us to derive an exact seesaw formula for the light and heavy Majorana neutrinos. We elucidate the reason why there is a mismatch between the mass eigenstates of heavy Majorana neutrinos associated with thermal leptogenesis and those associated with the seesaw framework, and establish the exact and explicit relations between the "original" and "derivational" seesaw parameters by using an Euler-like parametrization of the $6\times 6$ active-sterile flavor mixing matrix.

arXiv comment18 pages. The title changed, more discussions and references added, accepted for publication in NPB

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Cited by in corpus (2)

• CP violation in light neutrino oscillations and heavy neutrino decays: a general and explicit seesaw-bridged correlation
• Experimental Constraints on Seesaw Parameters in the Wigner-like Parametrization