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arXiv · hep-lat/0310014

Lattice study of exotic S=+1 baryon

Shoichi Sasaki
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Abstract

We propose S=+1 baryon interpolating operators, which are based on an exotic description of the antidecuplet baryon like diquark-diqaurk-antiquark. By using one of the new operators, the mass spectrum of the spin-1/2 pentaquark states is calculated in quenched lattice QCD at $β=6/g^2=6.2$ on a $32^3\times48$ lattice. It is found that the $J^P$ assignment of the lowest $Θ(uudd \bar s)$ state is most likely $(1/2)^-$. We also calculate the mass of the charm analog of the $Θ$ and find that the $Θ_c(uudd \bar c)$ state lies much higher than the $DN$ threshold, in contrast to several model predictions.

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Shoichi Sasaki. 2004-09-21. Lattice study of exotic S=+1 baryon. https://doi.org/10.1103/physrevlett.93.152001

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