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Neutrino Oscillations and Other Key Issues in Supersymmetric SU(4)_c \times SU(2)_L \times$ SU(2)_R

We try to gain an understanding of the recent Superkamiokande data on neutrino oscillations and several other important phenomenological issues within the framework of supersymmetric $SU(4)_c \times SU(2)_L \times SU(2)_R$ ($\equiv G_{422}$). By supplementing $G_{422}$ with a U(1)-${\cal R}$ symmetry, we can provide an explanation of the magnitude $M_G$ ($\sim 10^{16}$ GeV) of the $G_{422}$- symmetry breaking scale, resolve the MSSM $μ$ problem, and understand why proton decay has not been seen ($τ_p \gg 10^{34}$ yr). The family dependent ${\cal R}$ - symmetry also helps provide an explanation of the charged fermion mass hierarchies as well as the magnitudes of the CKM matrix elements. Several additional heavy states in the mass range $10^4-10^7$ GeV are predicted, and the MSSM parameter $\tan β$ turns out to be of order unity. The atmospheric neutrino problem is explained through $ν_μ-ν_τ$ mixing with $\sin^2 2θ_{μτ}\simeq 1$. The resolution of the solar neutrino puzzle is via the small angle MSW oscillations and necessarily requires a sterile neutrino $ν_s$ which, thanks to the ${\cal R}$ - symmetry, has a tiny mass.