Role of heavy-meson exchange in pion production near threshold

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dc.creatorHorowitz, C. J.
dc.creatorMeyer, H. O.
dc.creatorGriegel, D.
dc.date1993-04-06
dc.date.accessioned2026-07-07T11:14:59Z
dc.date.available2026-07-07T11:14:59Z
dc.descriptionRecent calculations of $s$-wave pion production have severely underestimated the accurately known $pp\rightarrow ppπ^0$\ total cross section near threshold. In these calculations, only the single-nucleon axial-charge operator is considered. We have calculated, in addition to the one-body term, the two-body contributions to this reaction that arise from the exchange of mesons. We find that the inclusion of the scalar $σ$-meson exchange current (and lesser contributions from other mesons) increases the cross section by about a factor of five, and leads to excellent agreement with the data. The results are neither very sensitive to changes in the distorting potential that generates the $NN$ wave function, nor to different choices for the meson-nucleon form factors. We argue that $pp\rightarrow ppπ^0$\ data provide direct experimental evidence for meson-exchange contributions to the axial current.
dc.description28 Pages, IU-NTC #93-07
dc.identifierhttps://arxiv.org/abs/nucl-th/9304004
dc.identifierhttp://arxiv.org/abs/nucl-th/9304004
dc.identifierPhys.Rev.C49:1337-1346,1994
dc.identifierdoi:10.1103/PhysRevC.49.1337
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/192263
dc.subjectNuclear Theory
dc.titleRole of heavy-meson exchange in pion production near threshold
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