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VOLUME 80 (2004) | ISSUE 6 | PAGE 439
Pentaquark decay is suppressed by chirality conservation
PACS: 12.38.-t, 12.39.-x
Abstract
It is shown, that if the pentaquark \Theta^+ = uudd\bar{s} baryon can be represented by the local quark current ηΘ, its decay Θ+ → n K+ (p K0) is forbidden in the limit of chirality conservation. The Θ+decay width Γ is proportional to \alpha^2_s \langle 0 \vert \bar{q} q \vert 0 \rangle^2, where \langle 0 \vert \bar{q} q \vert 0 \rangle, q = u,d,s is quark condensate, and, therefore, is strongly suppressed. The polarization operator of the pentaquark current is calculated using the operator product expansion. The Θ+ mass found by the QCD sum rules method is in a reasonable agreement with experiment.