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Lee, Hee-Jung; Kochelev, Nikolai; Vento Torres, Vicente | |||
Aquest document és un/a article, creat/da en: 2006 | |||
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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. | |||
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