Evidence for resonant structures in e+e-→π+π-hc |
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基金项目: | Supported by Ministry of Science and Technology of China (2009CB825203) and National Natural Science Foundation of China (NSFC) (10825524, 10935008, 11235011) |
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摘 要: | Abstract: The cross sections of e+e-→π+π-hc at center-of-mass energies from 3.90 to 4.42 GeV were measured by the BESIII and the CLEO-c experiments. Resonant structures are evident in the e+e-→π+π-hc line shape. The fit to the line shape results in a narrow structure at a mass of (4216±18) MeV/c2 and a width of (39±2) MeV, and a possible wide structure of mass (4293±9) MeV/c2 and width (222=k67) MeV. Here, the errors are combined statistical and systematic errors. This may indicate that the Y(4260) state observed in e+e-→π+π-J/ψ has a fine structure in it.
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关 键 词: | 电子政务 共振结构 证据 统计误差 实验测量 电子商务 细微结构 横截面 |
Evidence for resonant structures in e+e-→π+π-hc |
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Abstract: | charmonium, chramoniumlike states, e+e- annihilation, Exotics, Hybrids |
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Keywords: | charmonium chramoniumlike states e+e- annihilation Exotics Hybrids |
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