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