Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-01-10
Phys.Lett. B593 (2004) 165-174
Physics
High Energy Physics
High Energy Physics - Phenomenology
latex file, 16 pages
Scientific paper
10.1016/j.physletb.2004.03.093
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 $\mu\to e+\gamma$ process and the leptogenesis. The decay rate of $\mu\to e+\gamma$ 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.
Honda Mizue
Kaneko Satoru
Tanimoto Morimitsu
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