Understanding Pentaquark States in QCD

Details Understanding Pentaquark States in QCD Understanding Pentaquark States in QCD

2003-07-29

arxiv.org/abs/hep-ph/0307345v2

Phys.Rev.Lett. 91 (2003) 232002

Physics

High Energy Physics

High Energy Physics - Phenomenology

Scientific paper

10.1103/PhysRevLett.91.232002

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 $(1.55\pm 0.15)$ GeV. The experimentally observed baryon resonance $\Theta^+ (1540)$ with $S=+1$ can be consistently identified as a pentaquark state if its $J^P={1\over 2}^-$. Such a state is expected in QCD. If its parity is positive, this pentaquark state is really exotic. Now the outstanding issue is to determine its quantum numbers experimentally.

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