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arXiv · hep-ph/0408152

Pentaquark decay is suppressed by chirality conservation

B. L. Ioffe·A. G. Oganesian
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Abstract

It is shown, that if the pentaquark $Θ^+ = uudd\bar{s}$ baryon can be represented by the local quark current $η_Θ$, its decay $Θ^+ \to n K^+ (p K^0)$ is forbidden in the limit of chirality conservation. The $Θ^+$decay width $Γ$ is proportional to $α^2_s < 0 | \bar{q} q | 0 >^2$, where $<0 | \bar{q} q | 0 >$, $q = u,d,s$ is quark condensate, and, therefore, is strongly suppressed. Also the polarization operator of the pentaquark current with isospin 1 is calculated using the operator product expansion and estimation for it mass is obtained .

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B. L. Ioffe, A. G. Oganesian. 2005-06-20. Pentaquark decay is suppressed by chirality conservation. https://doi.org/10.1134/1.1830653

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