The narrow pentaquark

Details The narrow pentaquark The narrow pentaquark

2006-10-13

arxiv.org/abs/hep-ph/0610166v1

AIPConf.Proc.892:258-261,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

Write-up of the talks at Quarks-2006 (St. Petersburg, May 19-26, 2006) and at Quark Confinement and Hadron Spectrum VII (Ponta

Scientific paper

10.1063/1.2714388

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.

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