Jun Sugiyama, Takumi Doi, Makoto Oka
Published 2003-09-24, updated 2003-12-09Version 2
Exotic penta-quark baryon with strangeness +1, \Theta^+, 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 \Theta^+ 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 \Theta^+.
Comments: 7 pages, 3 figures, To be published in Phys.Lett.B
Journal: Phys.Lett. B581 (2004) 167-174
QCD sum rule approach for the light scalar mesons as four-quark states
$D^* D_s K$ and $D_s ^* D K$ vertices in a QCD Sum Rule approach
Spin-3/2 pentaquark in the QCD sum rule
