Universality of Quark-Lepton Mass Matrix

The recently observed lepton mixing angle $\theta_{13}$ of the MNS mixing matrix is well incorporated in a universal mixing hypothesis between quark and lepton sectors. This hypothesis asserts that, in the charged lepton diagonal base, all other mass matrices for up- and down-type quarks and light neutrinos are diagonalized by the same unitary matrix except for the phase elements. It is expressed as $V_{CKM}= U_{MNS}(\delta^\prime)^\dagger P U_{MNS}(\delta)$ for quark mixing matrix $V_{CKM}$ and lepton mixing matrix $U_{MNS}(\delta)$ in the phenomenological level. Here $P$ is a diagonal phase mass matrix. $\delta^\prime$ is a slightly different phase parameter from the Dirac CP violating phase $\delta=1.1\pi$ (best fit) in the MNS lepton mixing matrix.Comment: 6 pages, 2 figures, accepted by MPL

Measuring the lower bound of the neutrino mass at the LHC in Higgs triplet model

We show in the framework of Higgs triplet model that the lower bound of the neutrino mass is obtained if we can measure $\frac{\Gamma(\Delta^{--}\to ee)}{\Gamma(\Delta^{--}\to \mu\mu)}$ at the LHC.Comment: 5 pages, 2 figures, revised version in Pyhs.Rev.D. Using the reduced luminosity of LHC, we added the estimation on the order of magnitude of the considering reaction