https://doi.org/10.1140/epjc/s10052-023-11682-w
Regular Article - Theoretical Physics
Development of Bethe–Salpeter theory for dealing with unstable system
1
Department of Fundamental Courses, Shandong University of Science and Technology, 271019, Taian, China
2
Department of Physics, Sichuan University, 610064, Chengdu, China
3
Institute of Theoretical Physics, The Chinese Academy of Sciences, 100080, Beijing, China
4
CCAST (World Laboratory), P.O. Box 8730, 100080, Beijing, China
Received:
18
May
2023
Accepted:
4
June
2023
Published online:
12
June
2023
In the framework of relativistic quantum field theory, the solution of homogeneous Bethe–Salpeter equation for two-body bound state can not describe unstable system, so we develop Bethe–Salpeter theory to investigate resonance which is regarded as an unstable two-body system. Based on Bethe–Salpeter wave function, we consider the time evolution of two-body bound state determined by the total Hamiltonian. The total matrix element for arbitrary decay channel is expressed in terms of the Heisenberg picture, and Mandelstam’s approach is generalized to calculate the matrix element between bound states with respect to arbitrary value of the final state energy. Some innovations to Feynman diagram are made so that the key features of dispersion relation can be more clearly exhibited. This new resonance theory in quantum field theory is applied to investigate exotic particle which is considered as an unstable meson–meson molecular state.
© The Author(s) 2023
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