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《中国物理C》 2016-01
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Experimental review of e~+e~-→ππh_c

Qing-ping Ji;Yu-Ping Guo;Ai-Qiang Guo;Chun-Xu Yu;Zhi-Yong Wang;Department of Physics, Nankai University;Johannes Gutenberg University of Mainz;Institute of High Energy Physics, CAS;  
We review the recent BESIII measurement of e~+e~-→ππh_c in which its line shape is studied between the center-of-mass energies of 3.9 to 4.42 Ge V and an iso-vector charmonium-like state Z_c(4020) is observed in the invariant mass of πhc at the BESIII experiment. The charged Z_c(4020)~± is the second observed Z_c state following Z_c(3900), while the Z_c(4020)~0 is the first observed neutral Z_c state. The line shape of σ(e~+e~-→ππh_c) is also reanalyzed in view of searching for the Y state and the existence of the Y(4220) state is confirmed and compared with the previous work of the BESIII experiment.
【Fund】: Supported by Joint Large-Scale Scientific Facility Funds of the NSFC and CAS under Contracts No.U1332201;; National Natural Science Foundation of China(NSFC)under Contracts No.11475207
【CateGory Index】: O572.33
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