https://doi.org/10.1140/epjc/s10052-020-7820-2
Regular Article - Theoretical Physics
Y(4626) as a molecular state from interaction 
1
Department of Physics and Institute of Theoretical Physics, Nanjing Normal University, Nanjing, 210097, China
2
School of Physics, Southeast University, Nanjing, 210094, China
* e-mail: junhe@njnu.edu.cn
Received:
22
December
2019
Accepted:
10
March
2020
Published online:
17
March
2020
Recently, a new structure Y(4626) was reported by the Belle Collaboration in the process 
. In this work, we propose an assignment of the Y(4626) as a 
molecular state, which decays into the 
channel through a coupling between and 
channels. With the help of the heavy quark symmetry, the potential of the interaction is constructed within the one-boson-exchange model, and inserted into the quasipotential Bethe–Salpeter equation. The pole of obtained scattering amplitude is searched for in the complex-energy plane, which corresponds to a molecular state from the interaction . The results suggest that a pole is produced near the threshold, which exhibits as a peak in the invariant mass spectrum of the channel at about 4626 MeV. It obviously favors the Y(4626) as a molecular state. In the same model, other molecular states from the interaction are also predicted, which can be checked in future experiments.
© The Author(s), 2020
