Phenomenological study on the reactions

We extend our recent phenomenological study of pN→NNππ reactions to the reactions for anti-proton beam momenta up to 3.0 GeV within an effective Lagrangian approach. The contribution of N⁎(1440) with its Nσ decay mode is found to be dominant at the energies close to threshold for and channels. At higher energies or for and channels where N⁎(1440)→Nσ mode cannot contribute, large contributions from double-Δ, Δ(1600)→N⁎(1440)π, Δ(1600)→Δπ and Δ(1620)→Δπ are found. In the near-threshold region, sizeable contributions from Δ→Δπ, Δ→Nπ, N→Δπ and nucleon pole are also indicated. Although these results are similar to those for pN→NNππ reactions, the antinucleon–nucleon collisions are shown to be complementary to the nucleon–nucleon collisions and may even have advantages in some aspects. The PANDA/FAIR experiment is suggested to be an excellent place for studying the properties of relevant N⁎ and Δ⁎ resonances.