Phys. Rev. Lett. 91, 232002 (2003) [4 pages]Understanding Pentaquark States in QCDReceived 30 July 2003; published 3 December 2003 We estimate the mass of the pentaquark state with QCD sum rules and find that pentaquark states with isospin I=0,1,2 lie close to each other around (1.55±0.15) GeV. The experimentally observed baryon resonance Θ+(1540) with S=+1 can be consistently identified as a pentaquark state if its JP=1/2-. Such a state is expected in QCD. If its parity is positive, this pentaquark state is really exotic. The outstanding issue now is to determine its quantum numbers experimentally. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.91.232002
DOI:
10.1103/PhysRevLett.91.232002
PACS:
12.39.Mk, 12.38.Lg, 12.40.Yx
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