Evidence for resonant structures in e+e-&rarr;&pi;+&pi;-hc

YUAN Chang-Zheng

doi:10.1088/1674-1137/38/4/043001

Chinese Physics C> 2014, Vol. 38> Issue(4) : 043001 DOI: 10.1088/1674-1137/38/4/043001

Evidence for resonant structures in e⁺e^-→π⁺π^-h_c

YUAN Chang-Zheng

1.
Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

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The cross sections of e⁺e^-→π⁺π^-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^-→π⁺π^-h_c 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±32)MeV, and a possible wide structure of mass (4293±9)MeV/c² and 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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YUAN Chang-Zheng. Evidence for resonant structures in e⁺e^-→π⁺π^-h_c[J]. Chinese Physics C, 2014, 38(4): 043001. doi: 10.1088/1674-1137/38/4/043001

YUAN Chang-Zheng. Evidence for resonant structures in e⁺e^-→π⁺π^-h_c[J]. Chinese Physics C, 2014, 38(4): 043001. doi: 10.1088/1674-1137/38/4/043001 shu

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