QCD Sum Rules of Pentaquarks

Abstract

QCD sum rule is applied to the pentaquark spectroscopy. It is concluded that no positive parity state is seen in low energy region, while there may exist negative parity states at around 1.5 GeV. Choice of interpolating local operators and relation to the lattice calculations are discussed.

Comments: Invited talk presented at the PENTAQUARK04 at SPring-8 in July 20-23, 2004