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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81 Citations (Scopus)


We consider a [ud]2s̄ 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] 2d̄. Our results are compatible with the interpretation of the [ud]2d̄ state as being the Roper resonance N(1440), as suggested by Jaffe and Wilczek.

Original languageEnglish
Pages (from-to)323-329
Number of pages7
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number3-4
Publication statusPublished - 2004 Jan 8

Bibliographical note

Funding Information:
This work has been supported by CNPq and FAPESP (Brazil).

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


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