摘要
We review the recent BESIII measurement of e＋e-→ππhc in which its line shape is studied between the center-of-mass energies of 3.9 to 4.42 GeV and an iso-vector charmonium-like state Zc（4020） is observed in the invariant mass of 7rhc at the BESIII experiment. The charged Zc（4020）± is the second observed Zc state following Zc（3900）, while the Zc（4020）0 is the first observed neutral Zc state. The line shape of δ（e＋e-→ππhc）is also re-analyzed 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.
We review the recent BESIII measurement of e＋e-→ππhc in which its line shape is studied between the center-of-mass energies of 3.9 to 4.42 GeV and an iso-vector charmonium-like state Zc（4020） is observed in the invariant mass of 7rhc at the BESIII experiment. The charged Zc（4020）± is the second observed Zc state following Zc（3900）, while the Zc（4020）0 is the first observed neutral Zc state. The line shape of δ（e＋e-→ππhc）is also re-analyzed 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.
基金
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
