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QCD sum rule analysis of the pentaquark
2006
Physical Review D
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We perform a QCD sum rule calculation to determine the mass and the parity of the lowest lying pentaquark state. We include operators up to dimension d=13 in the OPE and the direct instanton contributions. We find evidence for a positive parity state. The contribution from operators of dimension d>5 is instrumental in determining the parity of the state and achieving the convergence of the sum rule.
doi:10.1103/physrevd.73.014010
fatcat:mt6atfdbs5hz3jgsqv5kfdohwm