https://doi.org/10.1140/epjc/s10052-019-7419-7
Regular Article - Theoretical Physics
Molecular states 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:
15
September
2019
Accepted:
19
October
2019
Published online:
4
November
2019
In this work, we systemically investigate the molecular states from the interaction with the help of the Lagrangians with heavy quark and chiral symmetries in a quasipotential Bethe–Salpeter equation (qBSE) approach. The molecular states are produced from isodoublet (I=1/2) 
interaction with spin parity 
and 
interaction with 
and 
. Their masses and widths are consistent with the 
, 
and 
observed at LHCb. The states, 
, 
and 
, are also produced with the same parameters. The isodoublet 
interaction with 
, as well as the isoquartet (I=3/2) interactions with and 
, interaction with and , are also attractive while very large cutoff is required to produce a molecular state. We also investigate the origin of the widths of these molecular states in the same qBSE frame. The 
channel is dominant in the decays of the states, 
, 
, 
, and 
. The 
state has large coupling to channel while the , 
and 
channels provide similar contributions to the width of the 
state. These results will be helpful to understand the current LHCb experimental results, and the three predicted states and the decay pattern of these hidden-charmed molecular pentaquarks can be checked in future experiments.
© The Author(s), 2019
