Angular distributions in J/ψ→pp¯π0(η) decays

The differential decay rates of the processes J/ψ→pp¯π0 and J/ψ→pp¯η close to the pp¯ threshold are calculated with the help of the NN¯ optical potential. The same calculations are made for the decays of ψ(2S)ψ(2S). We use the potential which has been suggested to fit the cross sections of NN¯ scattering together with NN¯ and six pion production in e+e−e+e− annihilation close to the pp¯ threshold. The pp¯ invariant mass spectrum is in agreement with the available experimental data. The anisotropy of the angular distributions, which appears due to the tensor forces in the NN¯ interaction, is predicted close to the pp¯ threshold. This anisotropy is large enough to be investigated experimentally. Such measurements would allow one to check the accuracy of the model of NN¯ interaction.