Non-interacting KN contribution in the QCD sum rule for the pentaquark Theta^+(1540)

Details Non-interacting KN contribution in the QCD sum rule for the pentaquark Theta^+(1540) Non-interacting KN contribution in the QCD sum rule for the pentaquark Theta^+(1540)

2005-05-06

arxiv.org/abs/hep-ph/0505040v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

7 pages, 5 figures, Talk given at Quark Nuclear Physics 2005 at Pyongchang, Korea, February 22-24, 2005

Scientific paper

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 J^P= 1/2^- Theta^+ around 1.5 GeV.

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