徳島大学 教育・研究者情報データベース(EDB)

1. 三重大学

1. (英) Chikira Yuichi / (日) 千喜良 祐一 / (読) ちきら ゆういち

   役割	任意	共著
   貢献度	任意
   学籍番号	推奨

2. 波場 直之

   役割	任意	共著
   貢献度	任意
   学籍番号	推奨

3. (英) Mimura Yukihiro / (日) 御村 幸広 / (読) みむら ゆきひろ

   役割	任意	共著
   貢献度	任意
   学籍番号	推奨

(英) THE SINGULAR SEESAW MECHANISM WITH HIERARCHICAL DIRAC NEUTRINO MASS

(英) The singular seesaw mechanism can naturally explain the atmospheric neutrino deficit by the maximal oscillation between $u_{u_L}$ and $u_{u_R}$. This mechanism can also induce three different scales of neutrino mass squared differences, which can explain the neutrino deficits of three independent experiments (solar, atmospheric, and LSND) by neutrino oscillations. In this paper we show that the realistic mixing angles among neutrinos can be obtained by introducing the hierarchy in the Dirac neutrino mass. In the case where Majorana neutrino mass matrix has rank 2, the solar neutrino deficit is explained by the vacuum oscillation between $u_e$ and $u_au$. We also consider the case where Majorana neutrino mass matrix has rank 1. In this case, the mater enhanced Mikheyev-Smirnov-Wolfenstein solar neutrino solution is prefered as the solution of the solar neutrino deficit.

(日) ニュートリノが pseudo-Dirac fermion である模型の解析をした．LSND実験結果を再現する可能性について評価した．