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The left-right models provide an explanation for the parity asymmetry in theStandard Model (SM). To further understand the origin of the left-rightsymmetry, we study a partial unification model based on SU(4)_W*U(1)_{B-L}which can be broken down to the minimal left-right model either through theHiggs mechanism in four dimensions or through the five-dimensional orbifoldgauge symmetry breaking with inner or outer automorphism. We scrutinize allthese breaking mechanisms and find that for the orbifold breaking in fivedimensions, the rank-reducing outer automorphism is better than the innerautomorphism and can make the low energy theory free of the U(1)_Z anomaly. Forthe four-dimensional model with the Higgs mechanism, we study in detail bothits structure and its typical phenomenology. It turns out that thisfour-dimensional scenario may predict some new phenomenology since the newmirror fermions (which are introduced in order to fill the SM fermions intoSU(4)_W without anomaly) are preserved at low energy scale and mix with the SMfermions. We also examine the gauge coupling unification in each case, anddiscuss the possibility for unifying this partial unification group with thePati-Salam group SU(4)_{PS} to realize a grand unification.

The SU(3)_C * SU(4)_W * U(1)_{B-L} Models with Left-Right Unification