The flavor properties of the instanton induced interaction in quarks motivate a two-cluster model for \Theta^+(uudd\bar{s}): a diquark (ud) and a triquark (ud\bar{s}) with an orbital motion characterized by angular momentum L=1 between them. \Theta^+ within this model has mass around 1595MeV and positive parity.
In order to establish the validity of the model we use the QCD sum rule method. We study initially the dynamics of the clusters. We recover a scenario which closely resembles the model calculation.
Finally, we proceed to a full five particle sum rule calculation contaning the OPE and direct instanton contributions. We discover the importance of higher dimensional operators in obtaining the correct parity, mass and convergence in the calculation. Our result supports the existence of a pentaquark of positive parity at about 1700 MeV.