Penta-quark baryon from the QCD Sum Rule
Jun Sugiyama, Takumi Doi, Makoto Oka
Abstract
Exotic penta-quark baryon with strangeness +1, Θ+, is studied in the QCD sum rule approach. We derive sum rules for the positive and negative parity baryon states with J=1/2 and I=0. It is found that the standard values of the QCD condensates predict a negative parity Θ+ of mass 1.5 GeV, while no positive parity state is found. We stress the roles of chiral-odd condensates in determining the parity and mass of Θ+.
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