https://doi.org/10.1140/epjc/s10052-022-10540-5
Regular Article - Theoretical Physics
Systematics of the heavy flavor hadronic molecules
1
School of Physics and Center of High Energy Physics, Peking University, 100871, Beijing, China
2
Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Department of Physics and Synergetic Innovation Center for Quantum Effects and Applications, Hunan Normal University, 410081, Changsha, China
3
Institut für Theoretische Physik II, Ruhr-Universität Bochum, 44780, Bochum, Germany
4
School of Physical Science and Technology, Hebei University, 071002, Baoding, China
5
Key Laboratory of High-precision Computation and Application of Quantum Field Theory of Hebei Province, 071002, Baoding, China
Received:
25
May
2022
Accepted:
17
June
2022
Published online:
4
July
2022
With a quark level interaction, we give a unified description of the loosely bound molecular systems composed of the heavy flavor hadrons 
, 
, and 
. Using the 
states as inputs to fix the interaction strength of light quark-quark pairs, we reproduce the observed 
and 
states and predict another narrow 
state with quantum numbers 
. If we require a satisfactory description of the and states simultaneously, our framework prefers the assignments of the 
and 
as the 
and 
states, respectively. We propose the isospin criterion to explain naturally why the experimentally observed 
, , and molecular candidates prefer the lowest isospin numbers. We also predict the loosely bound states for the bottom di-hadrons.
© The Author(s) 2022
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