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The perturbative leading order open string three-point couplings for theStandard Model with hidden USp(6) on fractional D6-branes on T6/Z6' fromarXiv:0806.3039 [hep-th], arXiv:0910.0843 [hep-th] are computed. PhysicalYukawa couplings consisting of holomorphic Wilsonian superpotential terms timesa non-holomorphic prefactor involving the corresponding classical open stringKaehler metrics are given, and mass terms for all non-chiral matter states arederived. The lepton Yukawa interactions are at leading order flavour diagonal,while the quark sector displays a more intricate pattern of mixings. While N=2supersymmetric sectors acquire masses via only two D6-brane displacements -which also provide the hierarchies between up- and down-type Yukawas within onequark or lepton generation -, the remaining vector-like states receive massesvia perturbative three-point couplings to some Standard Model singlet fieldswith vevs along flat directions. Couplings to the hidden sector and messengersfor supersymmetry breaking are briefly discussed.

Yukawa couplings and masses of non-chiral states for the Standard Model on D6-branes on T6/Z6'