Evidence for resonant structures in e+e-→π+π-hc

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YUAN Chang-Zheng. Evidence for resonant structures in e+e-→π+π-hc[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-hc[J]. Chinese Physics C, 2014, 38(4): 043001.  doi: 10.1088/1674-1137/38/4/043001 shu
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Received: 2013-12-24
Revised: 1900-01-01
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Evidence for resonant structures in e+e-→π+π-hc

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

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±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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