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26 April 2024 |
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The narrow pentaquark | | Dmitri Diakonov
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13 Oct 2006 | | Abstract: | The experimental status of the pentaquark searches is briefly reviewed. Recent null results by the CLAS collaboration are commented, and new strong evidence of a very narrow Theta+ resonance by the DIANA collaboration is presented. On the theory side, I revisit the argument against the existence of the pentaquark -- that of Callan and Klebanov -- and show that actually a strong resonance is predicted in that approach, however its width is grossly overestimated. A recent calculation gives 2 MeV for the pentaquark width, and this number is probably still an upper bound. | | Source: | arXiv, hep-ph/0610166 | | Services: | Forum | Review | PDF | Favorites | |
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