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

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

2003-08-29

arxiv.org/abs/hep-ph/0309001v2

Phys.Lett. B578 (2004) 323-329

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages RevTex4 and 3 eps figures. Revised version accepted for publication in Phys. Lett. B

Scientific paper

We consider a $[ud]^2\bar{s}$ current in the QCD sum rule framework to study the mass of the recently observed pentaquark state $\Theta^+(1540)$, 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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