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| New Vector Particles Observed at BESⅢ | |
| 摘 要： | <正>The Beijing Spectrometer Experiment(BESⅢ)has announced the observation of more new charmonium-like states.The experiment measured the e+e-→π+π-J/ψand e+e-→π+π-hc cross sections with high precision,using9fb-1 data collected with the BESⅢ detector at the BEPCII accelerator,and two resonant structures were observed in each decay mode.The first structure,Y(4220),with a mass of about 4.22 GeV,was seen in |
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