Abstract
Some recent progresses on the charmonium-like states from Belle experiment are reviewed including: (1) A new charged charmonium-like state Zc(4200)+ decaying to J/ψπ+ is observed with a significance of 6.2σ by performing an amplitude analysis of B¯0→J/ψK−π+ decays. The mass and width of the Zc(4200)+ are 4196−29−13+31+17 MeV/c2 and 370−70−70+70+132 MeV, respectively; the preferred JP = 1+; (2) A search for Zcs± resonant structures in the process e+ e− → K+ K−J/ψ is performed; (3) The cross sections of e+e− → π+π−ψ(2S) between 4.0 and 5.5 GeV are updated with full of data sample (980 fb−1). The properties of the Y (4360) and Y (4660) states are determined with improved precision. Evidence for a charged charmonium-like structure at 4.05 GeV/c2 is observed in the π±ψ(2S) intermediate state in the Y (4360) decays.
Published Version
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