Emergence of kaonium as a sharp resonance in photon-photon to meson-meson cross-sections

Alireza Beygi, S. P. Klevansky, R. H. Lemmer

We calculate the binding energies of the hypothetical mesonic atom, $K^{+}{K}^{-}$ (kaonium), using the $K^{+}{K}^{-}\to K^{+}{K}^{-}$ elastic scattering amplitude. Our findings are in line with…