The narrow pentaquark
高能物理 - 唯象学
2008-11-26 v1 高能物理 - 实验
摘要
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.
关键词
引用
@article{arxiv.hep-ph/0610166,
title = {The narrow pentaquark},
author = {Dmitri Diakonov},
journal= {arXiv preprint arXiv:hep-ph/0610166},
year = {2008}
}
备注
Write-up of the talks at Quarks-2006 (St. Petersburg, May 19-26, 2006) and at Quark Confinement and Hadron Spectrum VII (Ponta Delgada, Sep 2-7, 2006), 10 pp