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Are $Θ^+$ and the Roper resonance diquark-diquark-antiquark states?

R. D. Matheus·F. S. Navarra·M. Nielsen·R. Rodrigues da Silva·S. H. Lee
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Abstract

We consider a $[ud]^2\bar{s}$ current in the QCD sum rule framework to study the mass of the recently observed pentaquark state $Θ^+(1540)$, obtaining good agreement with the experimental value. We also study the mass of the pentaquark $[ud]^2\bar{d}$. Our results are compatible with the interpretation of the $[ud]^2\bar{d}$ state as being the Roper resonance N(1440), as suggested by Jaffe and Wilczek.

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R. D. Matheus, F. S. Navarra, M. Nielsen, R. Rodrigues da Silva, S. H. Lee. 2003-10-13. Are $Θ^+$ and the Roper resonance diquark-diquark-antiquark states?. https://doi.org/10.1016/j.physletb.2003.10.053

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