The role of electromagnetic interaction in the X(3872) and its analogs
arxiv(2024)
摘要
We investigate the role of the electromagnetic interaction in the formation
and decay of the X(3872). The binding properties of the X(3872) are studied
by assuming the molecular nature and considering the S-D wave mixing,
isospin breaking, and coupled channel effects, and in particular the correction
from the electromagnetic interaction. The radiative decays can better reflect
the difference between the charged and neutral DD̅^* components, since
the electromagnetic interaction explicitly breaks the isospin symmetry. We
further study the radiative decay widths with the obtained wave functions for
different DD̅^* channels. We also explore other similar hidden-charm
molecular states. The electromagnetic interaction can make the molecule
tighter. Our result of the radiative decay width for X(3872)→γ
J/ψ is in agreement with the experiment. The branching ratio
R_γψ is less than 1 in our framework, which supports the Belle and
BESIII measurements.
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