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Much work has been done by a number of authors with the aim of constructingthe supersymmetric Standard Model in type IIA intersecting-brane theoriescompactified on an orientifold with various Z_N or Z_M x Z_N point groups. Herewe consider the Z_{12} point group which has previously received comparativelylittle attention. We consider intersecting D6-branes that wrap 3-cyclesconsisting of a 2-cycle of the 4-dimensional lattice upon which the Z_{12} isrealised times a 1-cycle of the remaining 2-torus. Our discussion is restrictedto the case when these 2-cycles are "factorisable" in the sense discussed insection 3. Although it is possible to find models with the correctsupersymmetric Standard Model quark-doublet content, we have not found itpossible to obtain the correct quark-singlet content.

Intersecting D6-branes on the Z_{12}-II orientifold