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Seesaw Enhancement of Bi-large Mixing in Two-Zero Textures

Mizue Honda·Satoru Kaneko·Morimitsu Tanimoto
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Abstract

The seesaw enhancement of the bi-large mixings are discussed for the two-zero textures of the neutrino mass matrix. There are no large mixings in both Dirac neutrino mass matrix $m_D$ and right-handed Majorana neutrino mass matrix $M_R$, however, the bi-large mixing is realized via the seesaw mechanism. We present twelve sets of $m_D$ and $M_R$ for the seesaw enhancement and discuss the related phenomena, the $μ\to e+γ$ process and the leptogenesis. The decay rate of $μ\to e+γ$ is enough suppressed due to zeros in the Dirac neutrino mass matrix. Six $m_D$ lead to the lepton asymmetry, which can explain the baryon number in the universe. Other six $m_D$ are the real matrices, which give no CP asymmetry. Modified Dirac neutrino mass matrices are also discussed.

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Mizue Honda, Satoru Kaneko, Morimitsu Tanimoto. 2004-02-29. Seesaw Enhancement of Bi-large Mixing in Two-Zero Textures. https://doi.org/10.1016/j.physletb.2004.03.093

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