Impact ofpp→ppπ0data to negative-pion absorption on proton pairs

Recent data on the reaction pp→pp${\mathrm{\pi }}^0$ close to threshold indicate unexpectedly large s-wave pion production, with a possible explanation from a heavy meson exchange contribution to the axial charge. An amplitude with the same quantum numbers appears also in negative-pion absorption on proton pairs in light nuclei. In this paper the effect of this enhancement is estimated and found to be significant in the observables of absorption on ${}_{}{}^3{}_{}{}^{}\mathrm{He}$. Also some predictions are given for the qualitative effect in pn→(pp${)}_{\mathit{s}\mathrm{wave}}$ ${\mathrm{\pi }}^{\mathrm{-}}$