2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/44351We perform a QCD sum rule analysis for the pentaquark baryon Theta^+ with the non-interacting $KN$ contribution treated carefully. The coupling of the Theta^+ current to the $KN$ state is evaluated by applying the soft kaon theorem and vacuum saturation. When using a five-quark current including scalar and pseudo-scalar diquarks, the KN contribution turns out not to be very important and the previous result of the negative parity Theta^+ is reproduced again. The Borel analysis of the correlation function for Theta^+ with the KN continuum states subtracted yields the mass of the J^P= 1/2^- Theta^+ around 1.5 GeV.7 pages, 5 figures, Talk given at Quark Nuclear Physics 2005 at Pyongchang, Korea, February 22-24, 2005High Energy Physics - Phenomenologytext