https://doi.org/10.1140/epjc/s10052-020-08515-5
Regular Article - Theoretical Physics
The magnetic moment of 
as an axial-vector molecular state
1
Department of Physics, College of Liberal Arts and Sciences, National University of Defense Technology, 410073, Changsha, Hunan, China
2
Synergetic Innovation Center for Quantum Effects and Applications, Hunan Normal University, 410081, Changsha, Hunan, China
Received:
17
August
2020
Accepted:
2
October
2020
Published online:
15
October
2020
In this paper, we tentatively assign to be an axialvector molecular state, and calculate its magnetic moment using the QCD sum rule method in an external weak electromagnetic field. Starting with the two-point correlation function in the external electromagnetic field and expanding it in powers of the electromagnetic interaction Hamiltonian, we extract the mass and pole residue of the state from the leading term in the expansion and the magnetic moment from the linear response to the external electromagnetic field. The numerical values are 
in agreement with the experimental value 
, 
and 
.
© The Author(s) 2020
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