Z 3 orbifold construction of SU(3 ) 3 GUT with sin 2 θ 0 W =3/8
Abstract
It is argued that a phenomenologically viable grand unification model from superstring is
SU(3
)
3
, the simplest gauge group among the grand unifications of the electroweak hypercharge embedded in semi-simple groups. We construct a realistic 4D
SU(3
)
3
model with the GUT scale
sin
2
θ
0
W
=
3
8
in a
Z
3
orbifold with Wilson line(s). By two GUT scale vacuum expectation values, we obtain a rank 4 supersymmetric standard model below the GUT scale, and predict three more strange families.