https://doi.org/10.1140/epjc/s10052-025-14520-3
Regular Article - Theoretical Physics
Study the structure of X(3872) from its lineshape
1
School of Physics and Mechanical Electrical and Engineering, Hubei University of Education, 430205, Wuhan, China
2
Institute of Astronomy and High Energy Physics, Hubei University of Education, 430205, Wuhan, China
Received:
11
April
2025
Accepted:
14
July
2025
Published online:
1
August
2025
We fit the invariant mass distribution of 
from LHCb using the propagator for S-wave near-threshold states in effective field theory. In this way, we can directly determine the Z which measures the projection of the bound state on the compact state in X(3872). Consequently, the structure of X(3872) can be elucidated. Moreover, the fitting result also can describe well the data for 
from Belle experiment, which demonstrate the reliability of our fitting. The fitting indicates that Z is a non-vanishing value within error, which supports that X(3872) has a compact short-distant core.
© The Author(s) 2025
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Funded by SCOAP3.
