/ Phenomenology-HEP hep-ph/0506250

A QCD sum rule analysis of the pentaquark

Lee, Hee-Jung (Valencia U., IFIC) ; Kochelev, N.I. (Seoul Natl. U.) ; Vento, V. (Valencia U., IFIC)

Published in: Phys.Rev.
Year: 2006
Vol.: D73
Page No: 014010
Pages: 10

Abstract: 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.

Keyword(s): quarks ; instanton ; hadrons ; pentaquark

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