Regular Article - Theoretical Physics
Studying the molecule in the Bethe–Salpeter equation approach
Junior College, Zhejiang Wanli University, 315101, Ningbo, Zhejiang, China
2 Physics Department, Ningbo University, 315211, Ningbo, Zhejiang, China
3 College of Nuclear Science and Technology, Beijing Normal University, 100875, Beijing, China
Accepted: 5 July 2021
Published online: 21 July 2021
We interpret the as an S-wave molecular state in the Bethe–Salpeter equation approach with the ladder and instantaneous approximations for the kernel. By solving the Bethe–Salpeter equation numerically with the kernel containing one-particle-exchange diagrams and introducing three different form factors (monopole, dipole, and exponential form factors) in the verties, we find the bound state exists. We also study the decay width of the decay to .
© The Author(s) 2021
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