https://doi.org/10.1140/epjc/s10052-017-5328-1
Regular Article - Theoretical Physics
Combined fit to the 
and 
line shape
College of Physics and Electronic Engineering, Xinyang Normal University, Xinyang, 464000, People’s Republic of China
* e-mail: zhangjielei@ihep.ac.cn
Received:
9
September
2017
Accepted:
20
October
2017
Published online:
31
October
2017
We analyze the cross section of measured by Belle, BABAR and BESIII experiments. The parameters of the two resonances Y(4220) and Y(4360) are consistent with that in . A combined fit is performed to the two cross sections assuming the two resonances Y(4220) and Y(4360) have the same parameters. The parameters of Y(4220), Y(4360) and Y(4660) are determined to be 
MeV/c
, 
MeV; 
MeV/c, 
MeV; 
MeV/c, 
MeV, where the first uncertainties are statistical and the second systematic. The ratios 
and 
are also obtained, which may help in understanding the nature of these structures.
© The Author(s), 2017
