Penta-quark baryon from the QCD Sum Rule

Details Penta-quark baryon from the QCD Sum Rule Penta-quark baryon from the QCD Sum Rule

2003-09-24

arxiv.org/abs/hep-ph/0309271v2

Phys.Lett. B581 (2004) 167-174

Physics

High Energy Physics

High Energy Physics - Phenomenology

7 pages, 3 figures, To be published in Phys.Lett.B

Scientific paper

10.1016/j.physletb.2003.12.018

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^+.

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