A Predictive SUSY SO(10) X Delta (48) X U(1) Model for CP Violation, Neutrino Oscillation, Fermion Masses and Mixings with Very Low tan(beta)

Abstract

Assuming universality of Yukawa coupling of the superpotential and maximal spontaneous CP violation, fermion masses and mixing angles including that of neutrinos are studied in an SUSY SO(10)$\times \Delta (48)\times$ U(1) model with small $\tan \beta$. The low energy parameters of the standard model are determined solely by the Clebsch factors of the symmetry group and the structure of the physical vacuum. Thirteen parameters involving masses and mixing angles in the quark and charged lepton sector are successfully predicted by only four parameters with three of them determined by the scales of U(1)$\times \Delta(48)$, SO(10), SU(5) and SU(2)$_{L}$ symmetry breakings. An interesting prediction on ten parameters concerning the neutrino sector is also made by using the same four parameters. An additional parameter is added to obtain the mass and mixing of a sterile neutrino. It is found that the LSND $\bar{\nu}_{\mu} \rightarrow \bar{\nu}_{e}$ events, atmospheric neutrino deficit and the mass limit put by hot dark matter can be naturally explained. Solar neutrino puzzle can be solved only by introducing a sterile neutrino. $(\nu_{e} - \nu_{\tau})$ oscillation is found to have the same sensitive region as the $(\nu_{e} - \nu_{\mu})$ oscillation. The hadronic parameters $B_{K}$ and $f_{B}\sqrt{B}$ are extracted from the observed $K^{0}$-$\bar{K}^{0}$ and $B^{0}$-$\bar{B}^{0}$ mixings respectively. The direct CP violation ($\varepsilon'/\varepsilon$) in kaon decays and the three angles $\alpha$, $\beta$ and $\gamma$ of the unitarity triangle in the CKM matrix are also presented. More precise measurements of $\alpha_{s}(M_{Z})$, $|V_{cb}|$, $|V_{ub}/V_{cb}|$, $m_{t}$, as well as various CP violation and neutrino oscillation experiments will provide crucial tests for the present model.