https://doi.org/10.1140/epja/i2019-12706-6
Regular Article - Theoretical Physics
The 
reaction and 
molecular states
1
Department of Physics, Liaoning Normal University, 116029, Dalian, China
2
Departamento de Fısica Teórica and IFIC, Centro Mixto Universidad de Valencia-CSIC, Institutos de Investigación de Paterna, Apartado 22085, 46071, Valencia, Spain
3
School of Physics and Engineering, Zhengzhou University, 450001, Zhengzhou, Henan, China
* e-mail: dailr@lnnu.edu.cn
Received:
22
November
2018
Accepted:
23
January
2019
Published online:
15
March
2019
We study the 
reaction, and show that it is driven by the presence of two resonances, the X(3940) and X(3930), that are of molecular nature and couple most strongly to 
, but also to 
. Because of that, in the mass distribution we find a peak related to the excitation of the resonances and a cusp with large strength at the threshold.
© Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature, 2019
