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arXiv 1312.6399hep-exhep-ph
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e+e-到pi+pi-h_c共振结构的证据

Evidence for resonant structures in e+e- to pi+pi-h_c

Chang-Zheng Yuan

摘要:

用BESIII和CLEO-c实验测量了质心能量为3.90 - 4.42 GeV的e+e-到pi+pi-h_c的截面。共振结构在e+e-到pi+pi-h_c的线形中是明显的,与线形的拟合导致质量为(4216 \pm 18)MeV/c^2、宽度为(39 \pm 32)MeV的窄结构,以及质量为(4293 \pm 9)MeV/c^2、宽度为(222 \pm 67)MeV的可能的宽结构。这里的误差是统计误差和系统误差的组合。这可能表明在e+e- to pi+pi-J/psi中观察到的Y(4260)态具有精细结构。

英文摘要:

The cross sections of e+e- to pi+pi-h_c 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- to pi+pi-h_c line shape, the fit to the line shape results in a narrow structure at a mass of (4216\pm 18) MeV/c^2 and a width of (39\pm 32) MeV, and a possible wide structure of mass (4293\pm 9) MeV/c^2 and width (222\pm 67) MeV. Here the errors are combined statistical and systematic errors. This may indicate that the Y(4260) state observed in e+e- to pi+pi-J/psi has fine structure in it.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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