Implications of theE6SU(3)Hmodel

Besides the ordinary 27-multiplet fermions in the usual ${\mathrm{E}}_6$ grand unified theories, two superheavy 27-multiplet fermions are added to form the ${\mathrm{E}}_6$×SU(3${)}_{\mathrm{H}}$ model. After both vertical and horizontal spontaneous symmetry breaking, the Fritzsch mass matrices of the ordinary fermions arise as a result of mixing of the ordinary fermions with the superheavy fermions. The charged-fermion masses and Kobayashi-Maskawa mixing follow as a consequence. The neutrino mass in this model is also discussed.