https://doi.org/10.1140/epjc/s10052-020-08754-6
Regular Article - Theoretical Physics
Molecular states from 
and 
interactions
Department of Physics and Institute of Theoretical Physics, Nanjing Normal University, 210097, Nanjing, China
Received:
12
November
2020
Accepted:
10
December
2020
Published online:
22
December
2020
In this work, we preform a systematic investigation about hidden heavy and doubly heavy molecular states from the and interactions in the quasipotential Bethe–Salpeter equation (qBSE) approach. With the help of Lagrangians with heavy quark and chiral symmetries, interaction potentials are constructed within the one-boson-exchange model in which we include the 
, 
, 
, 
and 
exchanges, as well as 
or 
exchange. Possible bound states from the interactions considered are searched for as the pole of scattering amplitude. The results suggest that experimentally observed states, 
, 
, 
, and 
, can be related to the 
, 
, 
, and 
interactions with quantum numbers 
, respectively. The interaction is also attractive enough to produce a pole with 
which is related to the X(3872). Within the same theoretical frame, the existence of 
and 
molecular states with 
are predicted. The possible 
molecular states with 
and 
and their bottom partners are also suggested by the calculation. In the doubly heavy sector, no bound state is produced from the 
interaction while a bound state is found with 
from 
interaction. The 
interaction produces three molecular states with , 
and 
.
© The Author(s) 2020
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