Penta-quark baryon from the QCD Sum Rule

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 \simeq 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^+.

7 pages, 3 figures, To be published in Phys.Lett.B

References in corpus (4)

• Evidence for Narrow S=+1 Baryon Resonance in Photo-production from Neutron
• Exotic Anti-Decuplet of Baryons: Prediction from Chiral Solitons
• Negative-parity Nucleon Resonance in the QCD Sum Rule
• Interpretation of the Theta+ as an isotensor pentaquark with weakly decaying partners

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