https://doi.org/10.1140/epjc/s10052-019-6928-8
Regular Article - Theoretical Physics
Triangle singularity in the 
decays
1
Department of Physics, Guangxi Normal University, Guilin, 541004, China
2
School of Physics, Beihang University, Beijing, 100191, China
3
Departamento de Física Teórica and IFIC, Centro Mixto Universidad de Valencia-CSIC Institutos de Investigación de Paterna, Aptdo. 22085, 46071, Valencia, Spain
4
School of Physics and Engineering, Zhengzhou University, Zhengzhou, 450001, Henan, China
* e-mail: hxchen@buaa.edu.cn
Received:
9
March
2019
Accepted:
5
May
2019
Published online:
15
May
2019
We study the reaction and find that the mechanism to produce this decay develops a triangle singularity around 
MeV. The differential width 
shows a rapid growth around the invariant mass being 1515 MeV as a consequence of the triangle singularity of this mechanism, which is directly tied to the nature of the 
and 
as dynamically generated resonances from the interaction of pseudoscalar mesons. The branching ratios obtained for the decays are of the order of 
, accessible in present facilities, and we argue that their observation should provide relevant information concerning the nature of the low-lying scalar mesons.
© The Author(s), 2019
