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災害医療シミュレーション・システムを用いた首都直下地震の発災後死亡を効果的に減少させるために必要な施策の検討(Effective measures to reduce the number of deaths after the Tokyo Inland earthquake)

【目的】災害医療対応シミュレーション・システムを用いて，首都直下地震発災後の人的被害や医療資源を想定し，効果的な医療活動を行うために有効な施策を検討した。【対象と方法】東京都ガイドラインの傷病者フローに従った。発生傷病者数，病床数，保健医療活動チーム数，域内搬送用救急車数，広域医療搬送用回転翼機数の数値を変化させた際の発災後死亡者数への影響を検討した。【結果および考察】発生傷病者数が想定の21,511人では発災後死亡者数は6,641人（30.9%）であるが，想定の0.8倍では3,934 …

On the possibility of a search for the $L_\mu - L_\tau$ gauge boson at Belle-II and neutrino beam experiments

We study the possibilities of a search for the light and weakly interacting gauge boson in the gauged $L_\mu - L_\tau$ model. Introducing the kinetic mixing at the tree level, the allowed parameter regions for the gauge coupling and kinetic mixing …

Dirac CP phase in the neutrino mixing matrix and the Froggatt-Nielsen mechanism with $\det[M_\nu]=0$

We discuss the Dirac CP violating phase $\delta_{CP}$ in the Froggatt–Nielsen model for a neutrino mass matrix $M_\nu$ imposing a condition $\det$M_\nu$=0$. This additional condition restricts the CP violating phase $\delta_{CP}$ drastically. We …

CP violating phase from minimal texture neutrino mass matrix: Test of the phase relevant to leptogenesis

The model of neutrino mass matrix with minimal texture is now tightly constrained by experiment so that it can yield a prediction for the phase of CP violation. This phase is predicted to lie in the range $\delta_{CP}=0.77\pi–1.24\pi$. If neutrino …

Occam’s razor in lepton mass matrices: The sign of the universe’s baryon asymmetry

We discuss the neutrino mass matrix based on the Occam’s-razor approach in the framework of the seesaw mechanism. We impose four zeros in the Dirac neutrino mass matrix, which give the minimum number of parameters needed for the observed neutrino …