https://doi.org/10.1140/epjc/s10052-022-10332-x
Regular Article - Theoretical Physics
Composite nature of 
states from data analysis
1
Key Laboratory of Beam Technology of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, 100875, Beijing, People’s Republic of China
2
Beijing Radiation Center, 100875, Beijing, People’s Republic of China
Received:
3
March
2022
Accepted:
14
April
2022
Published online:
28
April
2022
We use a near-threshold parameterization with explicit inclusion of the Castillejo–Dalitz–Dyson poles, which is more general than the effective range expansion, to study the bottomonium-like states 
and 
. In terms of the partial-wave amplitude, we fit the event number distribution of 
system to the experimental data for these resonances from Belle Collaboration. The data could be described very well in our method, which supports the molecular interpretation. Then the relevant physical quantities are obtained, including the 
scattering length (a), effective range (r), and residue squared (
) of the pole in the complex plane. In particular, we find the compositeness can range from about 0.4 up to 1 for the 
(
) component in the resonance ().
The original online version of this article was revised: The email address of Xin-Heng Guo was removed.
Copyright comment corrected publication 2022
© The Author(s) 2022. corrected publication 2022
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