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We present an extension of the Standard Model inspired by the E_8 x E_8Heterotic String. In order that a reasonable effective Lagrangian is presentedwe neglect everything else other than the ten-dimensional N=1 supersymmetricYang-Mills sector associated with one of the gauge factors and certaincouplings necessary for anomaly cancellation. We consider a compactifiedspace-time M_4 x B_0 / Z_3, where B_0 is the nearly-Kaehler manifold SU(3)/U(1)x U(1) and Z_3 is a freely acting discrete group on B_0. Then we reducedimensionally the E_8 on this manifold and we employ the Wilson flux mechanismleading in four dimensions to an SU(3)^3 gauge theory with the spectrum of aN=1 supersymmetric theory. We compute the effective four-dimensional Lagrangianand demonstrate that an extension of the Standard Model is obtained withinteresting features including a conserved baryon number and fixed tree levelYukawa couplings and scalar potential. The spectrum contains new states such asright handed neutrinos and heavy vector-like quarks.

Dimensional Reduction of N=1, E_8 SYM over SU(3)/U(1) x U(1) x Z_3 and its four-dimensional effective action