https://doi.org/10.1140/epjc/s10052-018-5702-7
Regular Article - Theoretical Physics
Disclosing 
molecular states in the 
decay
1
Department of Physics, Liaoning Normal University, Dalian, 116029, China
2
Departamento de Física Teórica and IFIC, Institutos de Investigación de Paterna, Centro Mixto Universidad de Valencia-CSIC, Apartado 22085, 46071, Valencia, Spain
3
Instituto de Física, Universidade de São Paulo, Rua do Matão, 1371 Butantã, São Paulo, São Paulo, CEP 05508-090, Brazil
* e-mail: dailr@lnnu.edu.cn
Received:
25
January
2018
Accepted:
3
March
2018
Published online:
13
March
2018
We study the and 
reactions and show that they are related 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 cusp with large strength at the threshold and predict the ratio of strengths between the peak of the cusp and the maximum of the distribution close to threshold, which are distinct features of the molecular nature of these two resonances.
© The Author(s), 2018
