Non-interacting KN contribution in the QCD sum rule for the pentaquark Theta+(1540)
Youngshin Kwon, Atsushi Hosaka, Su Houng Lee
Abstract
We 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 JP= 1/2- Theta+ around 1.5 GeV.
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