Leptoquarks and vector-like strong interactions at the TeV scale

In a vector-like extension of the minimal standard model with mirror fermions leptoquarks can be bound states of fermion-mirror-fermion pairs held together by a new strong interaction at the TeV scale. The small couplings of leptoquarks to light fermion pairs arise due to mixing. The large Q² event excess at HERA and also the high E_T jet excess at Tevatron can potentially be explained.