Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-07-07
Prog.Theor.Phys. 104 (2000) 1173-1187
Physics
High Energy Physics
High Energy Physics - Phenomenology
LaTeX, 21 pages, 2 figures, some mistakes corrected
Scientific paper
10.1143/PTP.104.1173
We investigate the quantum effects for the democratic-type neutrino mass matrix given at the right-handed neutrino mass scale $m_R$ in order to see (i) whether $\theta_{23}=-\pi/4$ predicted by the model is stable to explain the atmospheric neutrino anomaly, (ii) how $\theta_{12}$ and $\theta_{13}$ behave, and (iii) whether the predicted Dirac CP phase $\delta$ keeps maximal size, at the weak scale $m_Z$. We find that, for the (inversely) hierarchical mass spectrum with $m_1\sim m_2$, $\theta_{23}$ and $\theta_{13}$ are stable, while $\theta_{12}$ is not so, which leads to the possibility that the solar neutrino mixing angle can become large at $m_Z$ even if it is taken small at $m_R$. We also show that $\delta$ keeps almost maximal for the above mass spectrum, and our model can give the large CP violation effect in the future neutrino oscillation experiments if the solar neutrino puzzle is explained by the large mixing angle MSW solution.
Miura Takahiro
Takasugi Eiichi
Yoshimura Masaki
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