1 X(1835) and η(1760) observed by BES Collaboration

ar X iv : 0 80 1 . 48 21 v 3 [ he p - ph ] 3 A pr 2 00 8 X ( 1835 ) and η ( 1760 ) observed by the BES Collaboration

With the assumption that the X(1835) and η(1760) recently observed by the BES Collaboration are the 3 1 S 0 meson states, the strong decays of these two states are investigated in the 3 P 0 decay model. We find that the predicted total widths of the X(1835) and η(1760) can be reasonably reproduced with the X(18350) − η(1760) mixing angle lying on the range q ¯ q members seems reasonable.

ar X iv : 0 80 1 . 48 21 v 2 [ he p - ph ] 2 8 Fe b 20 08 X ( 1835 ) and η ( 1760 ) observed by BES Collaboration

A Natural Candidate of η′’s Second Radial Excitation

Recently BES collaboration observed one interesting resonance X(1835). We point out that its mass, total width, production rate and decay pattern favor its assignment as the second radial excitation of η′ meson very naturally. PACS number: 12.39.Mk, 13.25.Jx, 11.30.Er

Light Four-quark States and New Observations by BES

Four-quark states are discussed within the constituent quark model. Incompleteness of existed studies of four-quark state with QCD sum rule is analyzed. The masses of diquark cluster were determined by QCD sum rules, and light four-quark states masses were obtained in terms of the diquark. The four-quark state possibility of the newly observed near-threshold pp̄ enhancement, X(1835), X(1812) and...

(BES Collaboration) †

BES data on J/ψ → γ(KK Sπ) are presented. There is a strong peak due to η(1440)/ι, which is fitted with a Breit-Wigner amplitude with s-dependent widths for decays to KK, κK, ηππ and ρρ; κ refers to the Kπ S-wave. At a KK̄π mass of ∼ 2040 MeV, there is a second peak with width ∼ 400 MeV; J = 0 is preferred over 1 and 2 respectively by 5.2 and 6.8 standard deviations. It is a possible candidate f...