Investigating S-wave bound states composed of two pseudoscalar mesons

In this study, we systematically investigated two-pseudoscalar meson systems with the Bethe-Salpeter equation in the ladder and instantaneous approximations. By solving the Bethe-Salpeter equation numerically with the kernel containing the one-particle exchange diagrams, we found that the

Automated summary

In this study, we systematically investigated systems with two pseudoscalar mesons and obtained some conclusions by numerically solving the Bethe-Salpeter equation.