Light Four-quark States and New Observations by BES
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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 p\bar p enhancement, X(1835), X(1812) and X(1576) by BES is discussed.
4pages, no figure, PTPTEX, talk at the Yukawa International Seminar (YKIS2006), "New frontiers in QCD", Kyoto, Japan
4pages, no figure, PTPTEX, talk at the Yukawa International Seminar (YKIS2006), "New frontiers in QCD", Kyoto, Japan