Influence of the
-channel on the properties of a proton-antiproton atom
Mur V.D. , Kudryavtsev A.E., Popov V.S.
The influence of the second channel (nh~) on nuclear level shifts and the probabilities of radiative transitions in the pp atom are determined. The obtained formulas can also be used for other hadronic atoms (Σ ~ρ, Κ ρ, etc.).