| Evidence for resonant structures in e~+e~-→π~+π~-h_c |
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| 引用本文： | 苑长征.Evidence for resonant structures in e~+e~-→π~+π~-h_c[J].中国物理 C,2014(4):7-10. |
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| 作者姓名： | 苑长征 |
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| 基金项目： | Supported by Ministry of Science and Technology of China(2009CB825203);National Natural Science Foundation of China(NSFC)(10825524,10935008,11235011) |
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| 摘 要： | 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 BES 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/c2and a width of(39±32) MeV, and a possible wide structure of mass(4293±9) MeV/c2and width(222±67) 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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