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ANKE@COSY data on the cross section of the reaction  pp  → { pp }  s π  0 , where { pp }  s   is the proton pair in the  1  S   0  state at small excitation energy  E pp   = 0 – 3 MeV, obtained at beam energies 0.5 - 2.0 GeV are analyzed within the one-pion exchange model. The model involves the subprocess  π  0   p  →  π  0   p  and accounts for the final state pp-interaction. A broad maximum observed in the cross section of the reaction  pp  → { pp }  s π  0  at 0.5 - 1.4 GeV in the forward direction is explained by this model as a dominant contribution of the isospin $\cfrac{3}{2}$ in the  π  0   p -scattering. The second bump in data at 2 GeV is underpredicted within this model by one order of magnitude. An explicit excitation of the Δ(1232)-isobar using the box-diagram is also considered in the region of the first maximum.

Δ-Isobar contribution to the pion production in the reaction pp → {pp}sπ0

Δ-Isobar contribution to the pion production in the reaction pp → {pp}_sπ⁰