https://doi.org/10.1140/epjc/s10052-018-5690-7
Regular Article - Theoretical Physics
The 
peak does not come from the “triangle singularity”
1
Department of Physics, State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing, 100871, China
2
Collaborative Innovation Center of Quantum Matter, Beijing, 100871, China
* e-mail: zhenghq@pku.edu.cn
Received:
2
October
2017
Accepted:
5
March
2018
Published online:
30
March
2018
We compare contributions from the triangle diagram and the 
bubble chain with the processes of 
and 
. By fitting the 
maximum spectrum and the spectrum, we find that the triangle diagram cannot explain the new experimental results from BESIII Collaboration at center of mass at 4.23 and 4.26 GeV, simultaneously. On the contrary, the molecular assignment of gives a much better description.
© The Author(s), 2018
