Narrow Results

We observe a narrow enhancement near 2m_p in the invariant mass spectrum of pairs from radiative decays. In the case of S-wave fit, the peak mass is below 2m_p at and the total width is Γ<30MeV at the 90% confidence level. And we also find near-threshold enhancement in the invariant mass spectrum of in decays. The mass is m=2075±12(stat)±5(syst)MeV and width is Γ=90±35(stat)±9(syst)MeV. A near-threshold enhancement is also studied and it has m=1.50~1.65GeV, Γ=70~110MeV with .

Some recent progresses in our understanding of penta-quark components in baryons is briefly reviewed. The diquark cluster picture for the penta-quark components in baryons gives a natural explanation not only to the empirical indications for a positive strangeness magnetic moment μ_s and positive strangeness radius of the proton but also the longstanding mass-reverse problem of N*(1535), N*(1440) and Λ*(1405) resonances as well as the unusual decay pattern of the N*(1535) resonance. Evidence supporting this picture from available BES data on J/ψ decays is pointed out.